Using probe molecule FTIR spectroscopy to identify and characterize Pt group metal based single atom catalysts

Size: px
Start display at page:

Download "Using probe molecule FTIR spectroscopy to identify and characterize Pt group metal based single atom catalysts"

Transcription

1 Chinese Journal of Catalysis 38 (2017) 催化学报 2017 年第 38 卷第 9 期 available at journal homepage: Perspective (Special Issue of the International Symposium on Single Atom Catalysis (ISSAC 2016)) Using probe molecule FTIR spectroscopy to identify and characterize Pt group metal based single atom catalysts Chithra Asokan a,, Leo DeRita a,, Phillip Christopher a,b,c, * 1. Introduction Optimizing the efficiency of platinum group metal (PGM) utilization in supported catalysts is critical due to the naturally low abundance, high costs, current demands, and expanding proposed applications of these metals. An emerging class of supported PGM catalysts that provides the potential for perfect metal utilization efficiency is single atom, or isolated site, PGMiso, catalysts where single PGM atoms are dispersed on a support [1 10]. The potential for perfect metal utilization requires that all PGMiso sites exist in similar local bonding environments creating a constant reactivity across all sites. While many reports have demonstrated the utility of PGMiso catalysts, the limited space for reactant adsorption at such sites suggests that the range of potential applications may ultimately be dictated by an ability to introduce additional functionality around PGMiso species. In addition to the design of synthesis methods for producing these atomically precise supported catalysts, it is critical to develop site specific characterization approaches that identify the existence of PGMiso species on supports, provide insight into their local bonding environment, and assess their reactivity. Aberration corrected scanning transmission electron microscopy (STEM) is an essential tool to provide proof of the existence of PGMiso on supports, although STEM analysis cannot offer details regarding the local environment of single metal atoms unless the support is very well defined [11]. In addition, a significant number of images are needed per sample to develop quantitative data regarding the concentration or fraction of PGMiso species in a sample. Thus, coupling STEM with other characterization approaches is useful for analyzing the uniformity of single atom existence throughout large samples and providing insights into the PGMiso environment. X ray absorption spectroscopy (XAS) is often coupled with STEM to characterize supported PGMiso species and is particularly useful when studying homogeneous single site species [11]. However, XAS analysis of supported PGMiso species can be difficult to interpret when there is coexistence of multiple single site species (ie. species located on different sites on the support) or the co existence of small clusters and PGMiso species. In this perspective, we describe how probe molecule Fourier transform infrared spectroscopy (FTIR) is a powerful site specific characterization technique that can be used to identify and quantify the concentration of PGMiso species in a catalyst sample, and provide insights into local geometry, stability, reactivity and homogeneity of supported PGMiso species. Probe molecule FTIR is particularly well suited for characterizing supported PGMiso species because bonds formed between probe molecules and PGMiso species are sensitive to local geometric and electronic environments, which induces changes in band width [1], frequency [12] and other characteristics of the adsorbed molecule s IR spectrum [13,14]. Furthermore, temperature programed FTIR experiments following coverage as a function of temperature can provide site specific adsorption energies [13,15,16]. As compared to STEM or XAS, probe molecule FTIR is economical in that it can detect low concentrations of PGMiso, is inexpensive, and only requires short times. We start this perspective by describing the use of CO probe molecule IR to identify supported single Pt atoms and then single Rh, Ir and Os atoms, with the defining difference between these systems being the number of CO molecules that stably binds per PGM atom, and end with outlooks on how probe molecule IR can be used to provide insights into reactivity, local structure, and homogeneity of PGMiso species. 2. Identifying PGMiso species The choice of probe molecule in FTIR characterization of catalysts is important to ensure that the frequency or band appearances of the adsorbed molecule will respond to various characteristics of the adsorption site, allowing for site specific analysis. For the characterization of supported PGMiso species, CO provides several beneficial attributes, such as: (1) each adsorption site is comparable to the size of one CO; (2) CO generally binds strongly enough to supported PGM structures to enable characterization by room temperature IR; (3) the polarization of CO is responsive to changes in metal charge, dipole dipole coupling with nearby CO, and the coordination number of the PGM site [17,18]. Other probe molecules such as

2 1474 Chithra Asokan et al. / Chinese Journal of Catalysis 38 (2017) NO may also be useful, although NO tends to dimerize, complicating site specific analysis, and NO is more likely to dissociate on metal surfaces compared to CO [19]. While CO is an ideal probe molecule in many regards, it is also important to note that CO can induce reconstruction of supported PGM species, which must be considered and is discussed further below [20 23]. In this section we start by discussing isolated Pt atoms, Ptiso, on supports. The first consideration in using CO probe molecule FTIR to differentiate the existence of Ptiso from other Pt structures, such as metallic Pt nanoparticles, Ptmetal, on a support is the expected stretching frequency of CO when adsorbed to each site. CO adsorbed to Ptmetal sites has been extensively studied, where it is known that the stretching frequency for linearly adsorbed CO is between cm 1, with variations derived from the coordination number of the Pt adsorption site and charge transfer between Ptmetal and the support. In addition to the linear adsorption geometry of CO on metal surfaces, CO can also bind in a bridge configuration between two metal atoms. The stretching frequency of CO when bound to bridge sites is typically redshifted to a lower frequency (~ cm 1 ) compared to the stretching frequency of linearly bound CO. Due to the bridging adsorption geometry requiring two metal atoms, the presence of this vibrational mode is indicative of metal nanoparticles existing. The absence of CO bound in the bridge geometry, while insufficient evidence alone, is a practical starting point to identify the presence of single atom adsorption sites, particularly for Pd atoms as CO binds preferentially to Pd nanoparticle surfaces in a bridge configuration [24]. By contrast, due to coordination with O atoms on the surface of metal oxide supports, or in the lattice of zeolites, Ptiso species are expected to exist in a cationic charge state, which is manifested spectroscopically in a blueshifted (higher wavenumber) band position of CO adsorbed to Ptiso compared to Ptmetal sites (either in the linear or bridge adsorption geometry), with reported stretching frequencies ranging from cm 1 [17,18,25]. In general it has been reported that the stretching frequency for CO on Ptiso is shifted to cm 1 higher frequencies compared to CO adsorbed in a linear geometry on Ptmetal clusters on the same support. The exact positions of both stretching frequencies are highly dependent on the direction and magnitude of charge transfer between Pt and the support. An example of this differentiation is shown in Fig. 1(a), where the IR spectra of CO adsorbed to Pt on H ZSM5 at room temperature for a range of catalysts with varying Pt loading are shown [2]. In these systems an organometallic Pt precursor was used to specifically promote Ptiso formation through interaction between the precursor and Al framework bonding sites and the catalyst was not reduced prior to characterization to minimize Ptmetal formation (see discussion further below on this). At the lowest weight loading, saturation of the catalyst by CO at room temperature produced a CO stretching band at 2115 cm 1, while at higher weight loadings an increasing intensity of a band at cm 1 was observed. Through correlation with STEM imaging of similar low loading catalysts, the 2115 cm 1 band was assigned to CO adsorbed on Ptiso species, while the band at cm 1 was assigned to CO adsorbed in a linear geometry to Ptmetal sites. In this case, as expected, CO on Ptiso exhibited a blueshifted (higher frequency) stretching frequency compared to CO on Ptmetal and furthermore it was demonstrated that complimentary techniques of probe molecule IR and STEM imaging provide an excellent way to identify Ptiso species. Apart from the frequency of the CO stretch, another critical spectroscopic signature for differentiating CO on Ptiso and Ptmetal sites (and this is general for all PGMs) is that the CO stretching frequency is independent of coverage when adsorbed to Ptiso, while the CO frequency redshifts with decreasing coverage on Ptmetal. Fig. 1(b) shows an example of this, where IR spectra were collected from a reduced 0.5% Pt/H mordenite (Hmor) catalyst that contained both Ptiso and Ptmetal species following CO adsorption at room temperature and purging of the system at increasing temperature. On Ptmetal sites the CO stretching frequency redshifts (from 2099 to 2073 cm 1 ) as coverage decreased due to increasing temperature. Conversely, as CO desorbs from Ptiso sites at increasing temperature there is no change in the stretching frequency. The coverage dependent shift on Ptmetal sites is due to dipole dipole coupling of adsorbed CO, where neighboring CO molecules vibrate in unison leading to a higher vibrational energy at higher coverage. Due to spatial separation of Ptiso species, there are no adjacent CO molecules in close enough proximity to induce coverage dependent frequency shifts due to dipole dipole coupling [3,25]. The lack of frequency shift with variation in coverage is an important signature of CO adsorption on PGMiso sites. While distinct identification of the existence of Ptiso and Ptmetal sites can be achieved by realizing that the frequencies and the coverage dependent frequency shifts for adsorbed CO are different, it is also important to differentiate Ptiso species from oxidized Pt clusters, Ptox, where Pt is in a cationic state for both structures. Differentiation of Ptiso and Ptox by CO IR requires analysis of the IR spectra of adsorbed CO following different catalyst pre treatments, as the band position for CO on these cationic sites has been reported to be similar ( cm 1 ). For example, Fig. 1(c) shows spectra of CO adsorbed to a 5% Pt/Hmor catalyst at room temperature, which was previously reduced at increasing temperature in hydrogen. With a mild reduction below 200 C where Ptox is known to only partially reduce the IR spectrum of adsorbed CO shows a broad band centered at ~2120 cm 1, a similar stretching frequency as was seen for CO on Ptiso in Fig. 1(b) [25]. When the 5% Pt catalyst was fully reduced and probed with CO, the band intensity associated with CO on cationic Pt sites completely disappeared. When comparing Fig. 1(b) and (c), the signature of CO bound to Ptiso remained after complete reduction (Fig. 1(b)), while the signature of CO bound to Ptox clusters disappeared after complete reduction (Fig. 1(c)). This example demonstrates that analyzing the stability of cationic Pt sites through increasing reduction temperature is critical for separating Ptiso and Ptox particles active sites when using IR analysis, as they otherwise exhibit similar stretching frequencies of adsorbed CO. Thus, combining variations in metal weight loading (where lower weight loading should promote Ptiso formation,

3 Chithra Asokan et al. / Chinese Journal of Catalysis 38 (2017) Fig. 1. Unique identification of Ptiso species. (a) IR spectra of CO adsorbed at saturation coverage and room temperature to different Pt/HZSM 5 catalysts containing varying Pt weight loading. Reproduced with permission from Ref. [2]. Copyright 2013 American Association for the Advancement of Science. (b) IR spectra of CO adsorbed on 0.5% Pt/Hmor catalyst at room temperature following a pretreatment of calcination at 500 C and reduction at 350 C, after purging with inert for 30 min at (1) 20, (2) 100, (3) 250 and (4) 350 C. (c) IR spectra of CO adsorbed on 5% Pt/Hmor catalyst at room temperature following pretreatment by calcination at 500 C and reduction in H2 at (1) 50, (2) 100, (3) 200 and (4) 500 C. (b) and (c) reproduced with permission from Ref. [25]. Copyright 1994 Royal Society of Chemistry. while higher loading should promote cluster formation) and catalyst pretreatment prior to CO IR analysis provide a good platform for differentiating the existence of Ptiso and Ptox species. However, it is worth mentioning that reduction of the catalyst could induce mobility of Ptiso species and Pt cluster formation and as a result, corollary characterization of the catalyst as a function of reduction temperature by STEM imaging is useful for ensuring the pre treatment used to differentiate Ptiso and Ptox species does not cause structural changes to the catalyst. We note that although Pt was the primary focus in this section, due to the similar electronic structure supported Pd species should exhibit similar spectroscopic trends to those described for Pt, with a primary difference being the preferred bridge adsorption site of CO on Pd metal clusters, as compared to atop adsorption site on Ptmetal clusters. 3. Evaluating PGMiso reactivity The utility of IR to study PGMiso extends beyond identification of the sites. Once the sites have been unambiguously identified, an in situ IR setup allows one to probe reactivity, compare adsorption strength of probe molecules on different sites, and explore possible reaction mechanisms by identifying the active site and quantifying changes in the spectra over the course of a reaction. There is strong evidence from surface science studies that CO adsorbs more strongly to Ptox sites compared to Ptmetal sites [15,16]. In characterizing the catalytic re

4 1476 Chithra Asokan et al. / Chinese Journal of Catalysis 38 (2017) activity of Ptiso species (and PGMiso species in general) a first step is to compare the adsorption energy of reactive species to Ptiso versus Ptmetal and Ptox sites. Initial work has suggested that the support can significantly influence the adsorption strength of CO on Ptiso (and Pdiso) species, where on FeOx and Al2O3 CO adsorbs weakly to the Ptiso and Pdiso sites, while on H ZSM5 CO adsorbs quite strongly to Ptiso [2 4]. This suggests the support plays a very important role, acting as a ligand to modify the reactivity of PGMiso species [9]. In addition to comparing the adsorption energy of probe molecules on each type of site, the reactivity in temperature programmed experiments can also be analyzed. An example of this type of experiment, where IR spectra of a CO saturated 2.6% Pt/HZSM 5 catalyst containing both Ptmetal and Ptiso species (confirmed by STEM imaging) during exposure to O2 at room temperature and at elevated temperatures is shown in Fig. 2(a). It was observed that CO molecules on Ptmetal sites (red area) were highly reactive in O2 (by the disappearance of the band), while CO on Ptiso (green) was stable in the O2 environment. The results suggest that Ptiso on HZSM 5 is much less reactive for CO oxidation compared to Ptmetal on HZSM 5. Clearly, the use of in situ temperature programmed IR experiments provide advantages over a traditional experiment using a thermal conductivity detector (TCD) or mass spectrometry signal, because this provides site specific information about the stability and reactivity of probe molecules. While differentiation of Ptiso (and likely Pdiso) from Ptmetal and Ptoxide sites using CO probe molecule IR requires consideration of band positions, coverage dependent frequency shifts, and pretreatment dependent signatures, other PGMiso species are easier to identify due to distinct probe molecule adsorption characteristics. In the case of Rh, Os, and Ir, it is energetically favorable to form metal gem dicarbonyl, M(CO)2, structures when site isolated species are exposed to sufficient CO pressure [1,9,13,14,26]. The M(CO)2 structures exhibit two characteristic CO stretches associated with the symmetric and asymmetric stretch of the 2 CO molecules. Bands associated with the symmetric and asymmetric stretches of the M(CO)2 structures typically occur at frequencies that are distinct from either linear or bridge bound CO to nanoparticles or clusters of the same metal, in either the oxidized or metallic state. These structures and their associated spectra when exposed to CO have been studied in great detail and the assignments relating structures to spectra have been rigorously substantiated [13,14,26]. An example of this is shown for a 4% Rh on TiO2 catalyst that was saturated by CO at room temperature followed by IR analysis (Fig. 2(b)). The modes at 2097 and 2028 cm 1 are assigned to the symmetric and asymmetric stretches of the Rh(CO)2 species, respectively, while the modes at 2068 and 1860 cm 1 are assigned to CO adsorbed in linear and bridge bound geometries, respectively, at Rhmetal cluster surfaces. We note that there are a few reports of gem dicarbonyls forming at defect sites on certain metal and metal oxide particles following harsh treatments [27]. Thus, conclusive relationships between the existence of the gem dicarbonyl bands in IR spectra and the existence of single metal atoms should be corroborated by coverage dependent measurements that show constant CO band position, or STEM measurements. In addition to rigorous assignment of CO adsorbed to various geometries of Rh sites, extinction coefficients for these stretches have been measured, enabling the use of CO IR for quantification of the relative or absolute number of each type of adsorption site [5,26]. For example, Rh/TiO2 catalysts with varying Rh weight loading were prepared and the IR spectra at Fig. 2. Probing the reactivity of PGMiso. (a) IR spectra of CO adsorbed on 2.6 wt% Pt/HZSM 5 catalyst in flowing O2 at varying exposure time and temperature. The band at >2100 cm 1 in green was assigned to CO on Ptiso and the band at <2100 cm 1 in red was assigned to CO on Ptmetal clusters. Reproduced with permission from Ref. [2]. Copyright 2013 American Association for the Advancement of Science. (b) IR spectrum of CO adsorbed at room temperature and saturation coverage on 4% Rh/TiO2. Ball and stick models of the assigned vibrational modes are also shown. (c) IR spectra of CO adsorbed to Rh/TiO2 catalysts at varying weight loadings is shown. (d) The fraction of exposed Rh atoms existing as Rhiso derived from quantitative IR is shown in a black line and the reverse water gas shift (r WGS) turn over frequency (TOF) is shown in red dots as a function of Rh weight loading. (b d) reproduced with permission from Ref. [5]. Copyright 2015 American Chemical Society.

5 Chithra Asokan et al. / Chinese Journal of Catalysis 38 (2017) saturation CO coverage and room temperature were collected (Fig. 2(c)). With increasing Rh weight loading the spectra shifted from being dominated by the modes associated with CO on Rhiso to the modes associated with CO on Rhmetal. Using the spectra in Fig. 2(c), the fraction of Rh sites existing at the surface of Rhmetal nanoparticles and as Rhiso species was quantified by deconvoluting the spectra, integrating the area under the peaks associated with the symmetric Rh(CO)2, linear CO on Rhmetal, and bridge CO on Rhmetal stretches, and normalizing the area by the site specific CO adsorption stoichiometry and extinction coefficients [5,26]. As shown by the black line in Fig. 2(d), the fraction of exposed Rh sites that exist as Rhiso species decreases from ~60% to ~8% as Rh weight loading increased from 0.5% to 6%. By relating the measured quantity of exposed Rhiso and Rhmetal sites on this series of catalysts to turn over frequencies (TOF) it was shown that selectivity in the reaction of CO2 reduction by H2 was controlled by the population of each type of site, where CO production through the reverse water gas reaction occurred only on Rhiso sites, while CH4 formation through CO2 methanation occurred on Rhmetal particles. This can be seen as the quantitative correlation between the fraction of sites existing as Rhiso and TOF for CO formation as a function of Rh weight loading in Fig. 2(d). This example shows conclusively how powerful the CO probe molecule IR technique can be, where the relative fraction of Rhiso species was quantified by CO IR and related to a unique catalytic characteristic of this site. These mechanistic insights were recently exploited to demonstrate that catalysts containing exclusively Rhiso can drive the water gas shift reaction with >95% CO conversion without forming CH4, which is important for industrial application [6]. Using extinction coefficients and FTIR band intensities to quantify single atom sites is one way to assign reactivity, but measuring changes in the gem dicarbonyl peak positions in situ can also provide insight about reaction intermediates and mechanisms. For example, recently the interaction of CO with Rhiso species and mechanism of CO oxidation on Rhiso species supported on phosphotungstic acid (NPTA) clusters was analyzed by following shifts in the band positions of Rh(CO)2 species and relating this to changing charge states of the complex [7]. When exposed to CO the catalyst consisting of solely Rhiso species on NPTA clusters exhibited 2 sets of dicarbonyl bands at 2108 & 2048 cm 1 and 2093 & 2034 cm 1, which were assigned to Rh(CO)2 3+ and Rh(CO)2 +, respectively. By following the loss of bands associated with Rh(CO)2 3+ species as a function of temperature and reactant partial pressure it was demonstrated that reduction of Rh(CO)2 3+ to Rh(CO)2 + could occur by CO abstraction of oxygen bound to Rh(CO)2 3+, which is a step involved in the CO oxidation catalytic cycle. 4. Characterizing local environment of PGMiso species We have discussed how CO probe molecule IR can be used to identify the existence of PGMiso sites, assign their reactivity in catalytic processes, and help elucidate insights into catalytic mechanisms. Another interesting area in utilizing probe molecule IR for characterizing PGMiso is in exploiting spectral characteristics to infer details associated with the local geometry of these species. For example, it is interesting to consider if PGMiso species reside in a single adsorption site on a support, or if there are multiple sites that exhibit degenerate adsorption energies for the single metal atom, thus meaning that the various PGMiso species on a sample are not homogeneous in their local environments. It was recently proposed that the full width at half max (FWHM) of modes assigned to CO on PGMiso species could be used as a qualitative indicator of the homogeneity of PGMiso CO complex adsorption sites on a support [1]. An example of this analysis is shown in Fig. 3(a), where the spectra of Ir(CO)2 species in solution and on various supports is compared. For Ir(CO)2 complexes synthesized on zeolite supports under optimized conditions the FWHM of the bands associated with the symmetric and asymmetric stretch are ~5 cm 1, which approaches the value for Ir(CO)2 complexes in solution, ~4 cm 1, suggesting that Ir(CO)2 species were adsorbed at a single site, or very few but similar sites, on the zeolite [1]. For the analogous case of Rh(CO)2, this is confirmed by theoretical calculations that identify a single most stable adsorption site for Rh(CO)2 a on zeolite support, see Fig. 3(b) [28]. In the Ir case, by varying synthetic conditions or zeolite characteristics the FWHM of the CO stretches increased, suggesting careful synthetic procedures are required for producing homogeneous PGMiso species. In contrast to zeolite supported Ir(CO)2 species, when using MgO or Al2O3 as a support, the FWHM of the CO stretches increases significantly, suggesting a plethora of Ir(CO)2 adsorption sites on the support. This can be explained by the many adsorption sites for PGMiso species that exist on metal oxides, which exhibit similar binding energies, as shown for the case of Rh(CO)2 on Al2O3 in Fig. 3(c) [29]. This is an important concept because when the catalytic reactivity of PGMiso species is examined at a mechanistic level it is critical to consider the local environment. When the local environment surrounding PGMiso species exist in many forms (as is the case shown for Ir(CO)2 on MgO in Fig. 3(a)), it is more difficult to understand PGMiso reactivity as compared to well defined systems, such as on zeolite supports. Interestingly, it can also be seen here that for acidic supports (zeolites) the CO stretching frequency of Ir(CO)2 is blueshifted (higher frequency) compared to the frequency in solution, while on basic supports the CO stretching frequency redshifts (lower frequency), demonstrating that the support directly acts as a ligand for PGMiso species [7]. It has previously been proposed that the spectral signature of the gem dicarbonyl species can indicate the local bonding geometry of Rhiso on a specific support [13,14]. Based on the ratio of the asymmetric and symmetric peak intensities, the bond angle between the two Rh CO bonds, θ, can be estimated using the following equation, Iasym 2 tan Isym where Iasym, and Isym are the symmetric and asymmetric peak intensities, respectively. The calculated bond angle is dependent on both the precious metal and the support. While angle is not necessarily an indicator of adsorption strength, certain sites may maintain stronger bonds when undergoing tempera

6 1478 Chithra Asokan et al. / Chinese Journal of Catalysis 38 (2017) Fig. 3. PGMiso adsorption site homogeneity. (a) IR spectra of Ir(CO)2 complexes on various supports and in solution. Reproduced with permission from Ref. [1]. Copyright 2016 American Chemical Society. (b) Schematic of the location and structure of Rh(CO)2 in a zeolite support from theoretical calculations. Reproduced with permission from Ref. [28]. Copyright 2000 American Chemical Society. (c) Schematics of the structure of various Rh(CO)2 adsorption sites on hydroxylated (001) and (100) γ Al2O3 surfaces. Reproduced with permission from Ref. [29]. Copyright 2013 American Chemical Society. ture programmed desorption and thus the overall average angle may change as a function of temperature. However, it is critical to consider that unless the sample contains only a single M(CO)2 adsorption site on the support, the resulting IR spectrum is a composite of the many M(CO)2 species that exist, complicating the analysis. 5. Outlook and conclusions As research expands into PGMiso species of various metals on various supports, it has become apparent that the support influences the reactivity of these catalysts as significantly as the metal. This is because in these catalysts, the metal atom and local environment of the support make up the active catalytic site and commonly the support plays an active role either by supplying OH or labile O species to the catalytic cycle [9,30]. The support is a ligand that sterically and electronically modifies the PGMiso species, but also can be actively involved in catalysis. Given the sensitivity of CO probe molecule IR to the local environment of PGMiso species, it is expected that this technique will play a critical role in developing insights into broad trends that exist and define how the support activates or inactivates PGMiso species for catalysis. By tailoring the microenvironment of the support PGMiso complex, and exploring this local environment with IR approaches, it is expected that predictive insights into site specific reactivity will be developed that enable enhanced catalytic activity, and thus better metal utilization efficiency, and unique reactivity that could bridge the gap between the specificity of heterogeneous and homogeneous catalysts. In addition to identifying the existence and characterizing the local environmental of single precious metal atoms on oxide supports, there is significant potential for the same approach to be useful in the characterization of single atom alloy catalysts [31,32]. However, the local coordination of the single atom dopants in metal surfaces is likely to significantly modify the behavior of the single atom compared to when it is supported on an oxide. There are significant challenges with using probe molecule FTIR to characterize PGMiso species. The first challenge, as

7 Chithra Asokan et al. / Chinese Journal of Catalysis 38 (2017) mentioned above, is the homogeneity of the PGMiso local environments on the support. The most useful insights into local environment from IR spectroscopy will be obtained for samples where the PGMiso species exist in a single location. Although, using the FWHM of probe molecule bands to identify samples with heterogeneous local environments may help to identify the particular locations on the support with desired reactivity. Furthermore, calcination, reduction, and exposure of probe molecules to catalysts may induce reconstruction, causing additional challenges for characterization [20 23]. Monitoring these effects during or after various treatments via corollary in situ or ex situ STEM and XAS characterization is critical for developing definitive probe molecule IR assignments to different adsorption sites. Given the well known ability of CO to induce mobility of PGMiso species of the support, causing particle formation or fragmentation depending on the metal and conditions, IR analysis at sub ambient temperature is expected to be useful for identifying the as synthetized structure of PGMiso based catalysts. In conclusion, it has become apparent that catalysts consisting of isolated or single atoms of PGMs on oxide support are introducing novel catalytic functionality and the possibility for enhanced metal utilization efficiency. The further development of these concepts requires the ability to characterize such dispersed metal species in terms of identifying their existence, analyzing their reactivity and providing insights into the local environment of these species. Probe molecule IR spectroscopy using CO is emerging as a very powerful approach to achieve these insights and push our understanding of PGMiso based catalysts forward. It is expected that with carefully continued development of this technique and corollary characterization by STEM imaging and XAS, we will begin to be able to tailor microenvironments surrounding PGMiso species to rationally design their reactivity. Acknowledgments P.C. acknowledges funding from the NSF CAREER ( ). These authors contributed equally to this work. Phillip Christopher a Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92521, USA b Program in Materials Science, University of California, Riverside, Riverside, CA 92521, USA c UCR Center for Catalysis, University of California, Riverside, Riverside, CA 92521, USA Tel: Fax: E mail: Christopher@engr.ucr.edu Received 9 June 2017 Published 5 September 2017 DOI: /S (17) References [1] A. S. Hoffman, C. Y. Fang, B. C. Gates, J. Phys. Chem. Lett., 2016, 7, [2] K. Ding, A. Gulec, A. M. Johnson, N. M. Schweitzer, G. D. Stucky, L. D. Marks, P. C. Stair, Science, 2015, 350, [3] B. T. Qiao, A. Q. Wang, X. F. Yang, L. F. Allard, Z. Jiang, Y. T. Cui, J. Y. Liu, J. Li, T. Zhang, Nat. Chem., 2011, 3, [4] E. J. Peterson, A. T. DeLaRiva, S. Lin, R. S. Johnson, H. Guo, J. T. Miller, J. H. Kwak, C. H. F. Peden, B. Kiefer, L. F. Allard, F. H. Ribeiro, A. K. Datye, Nat. Commun., 2014, 5, [5] J. C. Matsubu, V. N. Yang, P. Christopher, J. Am. Chem. Soc., 2015, 137, [6] H. L. Guan, J. Lin, B. T. Qiao, S. Miao, A. Q. Wang, X. D. Wang, T. Zhang, AIChE J., 2017, 63, [7] B. Zhang, H. Asakura, N. Yan, Ind. Eng. Chem. Res., 2017, 56, [8] M. Yang, J. L. Liu, S. Lee, B. Zugic, J. Huang, L. F. Allard, M. Flytzani Stephanopoulos, J. Am. Chem. Soc., 2015, 137, [9] J. Guzman, B. C. Gates, Dalton Trans., 2003, [10] J. Y. Liu, ACS Catal., 2017, 7, [11] J. D. Kistler, N. Chotigkrai, P. Xu, B. Enderle, P. Praserthdam, C. Y. Chen, N. D. Browning, B. C. Gates, Angew. Chem. Int. Ed., 2014, 53, Graphical Abstract Chin. J. Catal., 2017, 38: doi: /S (17) Using probe molecule FTIR spectroscopy to identify and characterize Pt group metal based single atom catalysts Chithra Asokan, Leo DeRita, Phillip Christopher * University of California, USA The utility, applications, and future directions of using probe molecule IR spectroscopy for identifying and characterizing catalysts consisting of supported Pt group metal single atom catalysts is presented in this perspective. Absorbance (a.u.) Probe molecule IR Wavenumber (cm 1 ) Identification, characteristics and reactive properties = Pt = Ti = O = C

8 1480 Chithra Asokan et al. / Chinese Journal of Catalysis 38 (2017) [12] J. Ryczkowski, Catal. Today, 2001, 68, [13] H. Miessner, I. Burkhardt, D. Gutschick, A. Zecchina, C. Morterra, G. Spoto, J. Chem. Soc., Faraday Trans. 1, 1989, 85, [14] J. T. Yates, T. M. Duncan, S. D. Worley, R. W. Vaughan, J. Chem. Phys., 1979, 70, [15] R. W. McCabe, L. D. Schmidt, Surf. Sci., 1977, 65, [16] R. W. McCabe, L. D. Schmidt, Surf. Sci., 1976, 60, [17] K. Chakarova, M. Mihaylov, K. Hadjiivanov, Microporous Mesoporous Mater., 2005, 81, [18] A. Y. Stakheev, E. S. Shpiro, O. P. Tkachenko, N. I. Jaeger, G. Schulz Ekloff, J. Catal., 1997, 169, [19] C. Lamberti, A. Zecchina, E. Groppo, S. Bordiga, Chem. Soc. Rev., 2010, 39, [20] M. J. Kale, P. Christopher, ACS Catal., 2016, 6, [21] T. Avanesian, S. Dai, M. J. Kale, G. W. Graham, X. Pan, P. Christopher, J. Am. Chem. Soc., 2017, 139, [22] F. Solymosi, M. Pasztor, J. Phys. Chem., 1985, 89, [23] B. R. Goldsmith, E. D. Sanderson, R. Ouyang, W. X. Li, J. Phys. Chem. C, 2014, 118, [24] H. Unterhalt, G. Rupprechter, H. J. Freund, J. Phys. Chem. B, 2002, 106, [25] V. L. Zholobenko, G. Lei, B. T. Carvill, B. A. Lerner, W. M. H. Sachtler, J. Chem. Soc., 1994, 90, [26] T. M. Duncan, J. T. Yates, R. W. Vaughan, J. Chem. Phys., 1980, 73, [27] W. F. Lin, S. G. Sun, Electrochim. Acta, 1996, 41, [28] J. F. Goellner, B. C. Gates, G. N. Vayssilov, N. Rösch, J. Am. Chem. Soc., 2000, 122, [29] O. M. Roscioni, J. M. Dyke, J. Evans, J. Phys. Chem. C, 2013, 117, [30] E. W. McFarland, H. Metiu, Chem. Rev., 2013, 113, [31] G. X. Pei, X. Y. Liu, A. Q. Wang, A. F. Lee, M. A. Isaacs, L. Li, X. L. Pan, X. F. Yang, X. D. Wang, Z. J. Tai, K. Wilson, T. Zhang, ACS Catal., 2015, 5, [32] G. Kyriakou, M. B. Boucher, A. D. Jewell, E. A. Lewis, T. J. Lawton, A. E. Baber, H. L. Tierney, M. Flytzani Stephanopoulos, E. H. Sykes, Science, 2012, 335, 利用探针分子红外光谱识别和表征铂族金属基单原子催化剂 Chithra Asokan a,, Leo DeRita a,, Phillip Christopher a,b,c,* a 加利福尼亚大学河滨分校化工与环境工程系, 加利福尼亚 92521, 美国 b 加利福尼亚大学河滨分校材料科学项目, 加利福尼亚 92521, 美国 c 加利福尼亚大学河滨分校催化 UCR 中心, 加利福尼亚 92521, 美国 摘要 : 单原子催化是提高贵金属利用率的有效手段, 而表征单原子催化剂是理解单原子催化的基础. 探针分子红外光谱可 用于识别和定量催化剂样品中孤立的 Pt 族金属物种的浓度, 从而得到负载的孤立的 Pt 族金属物种的局部几何形状 稳定性 活性及其分散性. 本文讨论了该技术用于识别和表征含负载型孤立的 Pt 族金属原子催化剂的效能 应用 以及未来的发展 方向. 关键词 : 单原子催化剂 ; 铂族金属 ; 红外光谱 ; 表征 ; 载体效应 收稿日期 : 接受日期 : 出版日期 : 共同第一作者. * 通讯联系人. 电话 : ; 传真 : ; 电子信箱 : Christopher@engr.ucr.edu 基金来源 : 国家科学基金会 ( ). 本文的英文电子版由 Elsevier 出版社在 ScienceDirect 上出版 (

Integrating non-precious-metal cocatalyst Ni3N with g-c3n4 for enhanced photocatalytic H2 production in water under visible-light irradiation

Integrating non-precious-metal cocatalyst Ni3N with g-c3n4 for enhanced photocatalytic H2 production in water under visible-light irradiation Chinese Journal of Catalysis 4 (219) 16 167 催化学报 219 年第 4 卷第 2 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Integrating non-precious-metal

More information

Effect of promoters on the selective hydrogenolysis of glycerol over Pt/W containing catalysts

Effect of promoters on the selective hydrogenolysis of glycerol over Pt/W containing catalysts Chinese Journal of Catalysis 37 (2016) 1513 1520 催化学报 2016 年第 37 卷第 9 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Effect of promoters on

More information

Effect of lengthening alkyl spacer on hydroformylation performance of tethered phosphine modified Rh/SiO2 catalyst

Effect of lengthening alkyl spacer on hydroformylation performance of tethered phosphine modified Rh/SiO2 catalyst Chinese Journal of Catalysis 37 (216) 268 272 催化学报 216 年第 37 卷第 2 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Effect of lengthening alkyl

More information

Synthesis of anisole by vapor phase methylation of phenol with methanol over catalysts supported on activated alumina

Synthesis of anisole by vapor phase methylation of phenol with methanol over catalysts supported on activated alumina Chinese Journal of Catalysis 37 (216) 72 726 催化学报 216 年第 37 卷第 5 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Synthesis of anisole by vapor

More information

Fabrication of ultrafine Pd nanoparticles on 3D ordered macroporous TiO2 for enhanced catalytic activity during diesel soot combustion

Fabrication of ultrafine Pd nanoparticles on 3D ordered macroporous TiO2 for enhanced catalytic activity during diesel soot combustion Chinese Journal of Catalysis 39 (2018) 606 612 催化学报 2018 年第 39 卷第 4 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Communication (Special Issue on

More information

Species surface concentrations on a SAPO 34 catalyst exposed to a gas mixture

Species surface concentrations on a SAPO 34 catalyst exposed to a gas mixture Chinese Journal of Catalysis 35 (214) 43 436 催化学报 214 年第 35 卷第 3 期 www.chxb.cn available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Species surface concentrations

More information

A new approach to inducing Ti 3+ in anatase TiO2 for efficient photocatalytic hydrogen production

A new approach to inducing Ti 3+ in anatase TiO2 for efficient photocatalytic hydrogen production Chinese Journal of Catalysis 39 (2018) 510 516 催化学报 2018 年第 39 卷第 3 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue of Photocatalysis

More information

A highly efficient flower-like cobalt catalyst for electroreduction of carbon dioxide

A highly efficient flower-like cobalt catalyst for electroreduction of carbon dioxide Chinese Journal of Catalysis 39 (2018) 914 919 催化学报 2018 年第 39 卷第 5 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article A highly efficient flower-like

More information

Increasing the range of non noble metal single atom catalysts

Increasing the range of non noble metal single atom catalysts Chinese Journal of Catalysis 38 (2017) 1489 1497 催化学报 2017 年第 38 卷第 9 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Perspective (Special Issue of

More information

Single-atom catalysis: Bridging the homo- and heterogeneous catalysis

Single-atom catalysis: Bridging the homo- and heterogeneous catalysis Chinese Journal of Catalysis 39 (2018) 893 898 催化学报 2018 年第 39 卷第 5 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Review Single-atom catalysis: Bridging

More information

available at journal homepage:

available at  journal homepage: Chinese Journal of Catalysis 38 (2017) 1860 1869 催化学报 2017 年第 38 卷第 11 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Solid base catalysts

More information

Enhancement of the activity and durability in CO oxidation over silica supported Au nanoparticle catalyst via CeOx modification

Enhancement of the activity and durability in CO oxidation over silica supported Au nanoparticle catalyst via CeOx modification Chinese Journal of Catalysis 39 (2018) 1608 1614 催化学报 2018 年第 39 卷第 10 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Enhancement of the activity

More information

Wheat flour derived N doped mesoporous carbon extrudes as an efficient support for Au catalyst in acetylene hydrochlorination

Wheat flour derived N doped mesoporous carbon extrudes as an efficient support for Au catalyst in acetylene hydrochlorination Chinese Journal of Catalysis 39 (218) 1664 1671 催化学报 218 年第 39 卷第 1 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Wheat flour derived N doped

More information

Ni based catalysts derived from a metal organic framework for selective oxidation of alkanes

Ni based catalysts derived from a metal organic framework for selective oxidation of alkanes Chinese Journal of Catalysis 37 (2016) 955 962 催化学报 2016 年第 37 卷第 6 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue on Environmental

More information

Steering plasmonic hot electrons to realize enhanced full spectrum photocatalytic hydrogen evolution

Steering plasmonic hot electrons to realize enhanced full spectrum photocatalytic hydrogen evolution Chinese Journal of Catalysis 39 (2018) 453 462 催化学报 2018 年第 39 卷第 3 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue of Photocatalysis

More information

available at journal homepage:

available at   journal homepage: Chinese Journal of Catalysis 40 (2019) 141 146 催化学报 2019 年第 40 卷第 2 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Communication The origin of the

More information

Effects of Au nanoparticle size and metal support interaction on plasmon induced photocatalytic water oxidation

Effects of Au nanoparticle size and metal support interaction on plasmon induced photocatalytic water oxidation Chinese Journal of Catalysis 39 (18) 1219 1227 催化学报 18 年第 39 卷第 7 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Effects of Au nanoparticle

More information

Growth of Cu/SSZ 13 on SiC for selective catalytic reduction of NO

Growth of Cu/SSZ 13 on SiC for selective catalytic reduction of NO Chinese Journal of Catalysis 39 (2018) 71 78 催化学报 2018 年第 39 卷第 1 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Growth of Cu/SSZ 13 on SiC

More information

The dynamic N1-methyladenosine methylome in eukaryotic messenger RNA 报告人 : 沈胤

The dynamic N1-methyladenosine methylome in eukaryotic messenger RNA 报告人 : 沈胤 The dynamic N1-methyladenosine methylome in eukaryotic messenger RNA 报告人 : 沈胤 2016.12.26 研究背景 RNA 甲基化作为表观遗传学研究的重要内容之一, 是指发生在 RNA 分子上不同位置的甲基化修饰现象 RNA 甲基化在调控基因表达 剪接 RNA 编辑 RNA 稳定性 控制 mrna 寿命和降解等方面可能扮演重要角色

More information

Effect of the degree of dispersion of Pt over MgAl2O4 on the catalytic hydrogenation of benzaldehyde

Effect of the degree of dispersion of Pt over MgAl2O4 on the catalytic hydrogenation of benzaldehyde Chinese Journal of Catalysis 38 (2017) 1613 1620 催化学报 2017 年第 38 卷第 9 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue of the

More information

In situ DRIFTS study of the mechanism of low temperature selective catalytic reduction over manganese iron oxides

In situ DRIFTS study of the mechanism of low temperature selective catalytic reduction over manganese iron oxides Chinese Journal of Catalysis 35 (2014) 294 301 催化学报 2014 年第 35 卷第 3 期 www.chxb.cn available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article In situ DRIFTS study of the

More information

Photocatalytic hydrogen evolution activity over MoS2/ZnIn2S4 microspheres

Photocatalytic hydrogen evolution activity over MoS2/ZnIn2S4 microspheres Chinese Journal of Catalysis 38 (2017) 2067 2075 催化学报 2017 年第 38 卷第 12 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue on Photocatalysis

More information

Chinese Journal of Applied Entomology 2014, 51(2): DOI: /j.issn 信息物质的化学分析技术 黄翠虹 , ; 2.

Chinese Journal of Applied Entomology 2014, 51(2): DOI: /j.issn 信息物质的化学分析技术 黄翠虹 , ; 2. Chinese Journal of Applied Entomology 204, 5(2): 586 590. DOI: 0.7679/j.issn.2095 353.204.069 信息物质的化学分析技术 * 李静静 雷彩燕 黄翠虹 2 周琳 闫凤鸣 **., 450002; 2., 528333 摘要 - GC-MS HPLC GC-MS 关键词 - Chemical analysis techniques

More information

Synthesis of Ag/AgCl/Fe S plasmonic catalyst for bisphenol A degradation in heterogeneous photo Fenton system under visible light irradiation

Synthesis of Ag/AgCl/Fe S plasmonic catalyst for bisphenol A degradation in heterogeneous photo Fenton system under visible light irradiation Chinese Journal of Catalysis 38 (217) 1726 1735 催化学报 217 年第 38 卷第 1 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Synthesis of Ag/AgCl/Fe

More information

Visible light responsive carbon decorated p type semiconductor CaFe2O4 nanorod photocatalyst for efficient remediation of organic pollutants

Visible light responsive carbon decorated p type semiconductor CaFe2O4 nanorod photocatalyst for efficient remediation of organic pollutants Chinese Journal of Catalysis 38 (217) 177 1779 催化学报 217 年第 38 卷第 1 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Visible light responsive

More information

Influence of surface strain on activity and selectivity of Pd based catalysts for the hydrogenation of acetylene: A DFT study

Influence of surface strain on activity and selectivity of Pd based catalysts for the hydrogenation of acetylene: A DFT study Chinese Journal of Catalysis 39 (2018) 1493 1499 催化学报 2018 年第 39 卷第 9 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Influence of surface strain

More information

Effects of composite oxide supports on catalytic performance of Ni-based catalysts for CO methanation

Effects of composite oxide supports on catalytic performance of Ni-based catalysts for CO methanation Chinese Journal of Catalysis 34 (2013) 330 335 催化学报 2013 年第 34 卷第 2 期 www.chxb.cn available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Effects of composite oxide supports

More information

Silver catalyzed three component reaction of phenyldiazoacetate with arylamine and imine

Silver catalyzed three component reaction of phenyldiazoacetate with arylamine and imine Chinese Journal of Catalysis 39 (2018) 1594 1598 催化学报 2018 年第 39 卷第 10 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Communication Silver catalyzed

More information

Magnetic Co/Al2O3 catalyst derived from hydrotalcite for hydrogenation of levulinic acid to γ-valerolactone

Magnetic Co/Al2O3 catalyst derived from hydrotalcite for hydrogenation of levulinic acid to γ-valerolactone Chinese Journal of Catalysis 36 (2015) 1512 1518 催化学报 2015 年第 36 卷第 9 期 www.chxb.cn available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Communication (Special Issue for Excellent

More information

Zinc doped g C3N4/BiVO4 as a Z scheme photocatalyst system for water splitting under visible light

Zinc doped g C3N4/BiVO4 as a Z scheme photocatalyst system for water splitting under visible light Chinese Journal of Catalysis 39 (218) 472 478 催化学报 218 年第 39 卷第 3 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue of Photocatalysis

More information

Resistance to SO2 poisoning of V2O5/TiO2 PILC catalyst for the selective catalytic reduction of NO by NH3

Resistance to SO2 poisoning of V2O5/TiO2 PILC catalyst for the selective catalytic reduction of NO by NH3 Chinese Journal of Catalysis 37 (216) 888 897 催化学报 216 年第 37 卷第 6 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue on Environmental

More information

Synthesis of PdS Au nanorods with asymmetric tips with improved H2 production efficiency in water splitting and increased photostability

Synthesis of PdS Au nanorods with asymmetric tips with improved H2 production efficiency in water splitting and increased photostability Chinese Journal of Catalysis 39 (2018) 407 412 催化学报 2018 年第 39 卷第 3 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Communication (Special Issue of

More information

Activity and selectivity of propane oxidative dehydrogenation over VO3/CeO2(111) catalysts: A density functional theory study

Activity and selectivity of propane oxidative dehydrogenation over VO3/CeO2(111) catalysts: A density functional theory study Chinese Journal of Catalysis 39 (218) 152 1526 催化学报 218 年第 39 卷第 9 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Activity and selectivity

More information

Single atom catalyst by atomic layer deposition technique

Single atom catalyst by atomic layer deposition technique Chinese Journal of Catalysis 38 (2017) 1508 1514 催化学报 2017 年第 38 卷第 9 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Minireview (Special Issue of the

More information

Highly effective electrochemical water oxidation by copper oxide film generated in situ from Cu(II) tricine complex

Highly effective electrochemical water oxidation by copper oxide film generated in situ from Cu(II) tricine complex Chinese Journal of Catalysis 39 (218) 479 486 催化学报 218 年第 39 卷第 3 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue of Photocatalysis

More information

Photo induced self formation of dual cocatalysts on semiconductor surface

Photo induced self formation of dual cocatalysts on semiconductor surface Chinese Journal of Catalysis 39 (2018) 1730 1735 催化学报 2018 年第 39 卷第 11 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Communication Photo induced self

More information

Synthesis and photocatalytic hydrogen production activity of the Ni CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7 hybrid layered perovskite

Synthesis and photocatalytic hydrogen production activity of the Ni CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7 hybrid layered perovskite Chinese Journal of Catalysis 38 (217) 239 247 催化学报 217 年第 38 卷第 12 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue on Photocatalysis

More information

XPS and TPD study of NO interaction with Cu(111): Role of different oxygen species

XPS and TPD study of NO interaction with Cu(111): Role of different oxygen species Chinese Journal of Catalysis 34 (2013) 964 972 催化学报 2013 年第 34 卷第 5 期 www.chxb.cn available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue in Memory of

More information

Synthesis of novel p n heterojunction m Bi2O4/BiOCl nanocomposite with excellent photocatalytic activity through ion etching method

Synthesis of novel p n heterojunction m Bi2O4/BiOCl nanocomposite with excellent photocatalytic activity through ion etching method Chinese Journal of Catalysis 39 (218) 218 4 64 3 W Y 3/7 排英 + 中 14 页催化学报 218 年第 39 卷第 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Synthesis

More information

Recent progress in Ag3PO4 based all solid state Z scheme photocatalytic systems

Recent progress in Ag3PO4 based all solid state Z scheme photocatalytic systems Chinese Journal of Catalysis 38 (2017) 1794 1803 催化学报 2017 年第 38 卷第 11 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Minireview Recent progress in

More information

In situ preparation of mesoporous Fe/TiO2 catalyst using Pluronic F127 assisted sol gel process for mid temperature NH3 selective

In situ preparation of mesoporous Fe/TiO2 catalyst using Pluronic F127 assisted sol gel process for mid temperature NH3 selective Chinese Journal of Catalysis 38 (17) 1831 1841 催化学报 17 年第 38 卷第 11 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article In situ preparation of mesoporous

More information

La doped Pt/TiO2 as an efficient catalyst for room temperature oxidation of low concentration HCHO

La doped Pt/TiO2 as an efficient catalyst for room temperature oxidation of low concentration HCHO Chinese Journal of Catalysis 38 (217) 39 47 催化学报 217 年第 38 卷第 1 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article La doped Pt/TiO2 as an efficient

More information

Mesoporous polyoxometalate based ionic hybrid as a highly effective heterogeneous catalyst for direct hydroxylation of benzene to phenol

Mesoporous polyoxometalate based ionic hybrid as a highly effective heterogeneous catalyst for direct hydroxylation of benzene to phenol Chinese Journal of Catalysis 39 (18) 334 341 催化学报 18 年第 39 卷第 2 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Mesoporous polyoxometalate based

More information

Surface reactions of CuCl2 and HY zeolite during the preparation of CuY catalyst for the oxidative carbonylation of methanol

Surface reactions of CuCl2 and HY zeolite during the preparation of CuY catalyst for the oxidative carbonylation of methanol Chinese Journal of Catalysis 35 (14) 134 139 催化学报 14 年第 35 卷第 1 期 www.chxb.cn available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Surface reactions of CuCl2 and HY

More information

In plasma catalytic degradation of toluene over different MnO2 polymorphs and study of reaction mechanism

In plasma catalytic degradation of toluene over different MnO2 polymorphs and study of reaction mechanism Chinese Journal of Catalysis 38 (217) 793 84 催化学报 217 年第 38 卷第 5 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article In plasma catalytic degradation

More information

Highlights of the major progress in single atom catalysis in 2015 and 2016

Highlights of the major progress in single atom catalysis in 2015 and 2016 Chinese Journal of Catalysis 38 (2017) 1498 1507 催化学报 2017 年第 38 卷第 9 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Minireview (Special Issue of the

More information

Enhancement of catalytic activity by homo-dispersing S2O8 2 -Fe2O3 nanoparticles on SBA-15 through ultrasonic adsorption

Enhancement of catalytic activity by homo-dispersing S2O8 2 -Fe2O3 nanoparticles on SBA-15 through ultrasonic adsorption Chinese Journal of Catalysis 39 (2018) 955 963 催化学报 2018 年第 39 卷第 5 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Enhancement of catalytic

More information

Design, Development and Application of Northeast Asia Resources and Environment Scientific Expedition Data Platform

Design, Development and Application of Northeast Asia Resources and Environment Scientific Expedition Data Platform September, 2011 J. Resour. Ecol. 2011 2(3) 266-271 DOI:10.3969/j.issn.1674-764x.2011.03.010 www.jorae.cn Journal of Resources and Ecology Vol.2 No.3 NE Asia Design, Development and Application of Northeast

More information

La1 xcaxmn1 yalyo3 perovskites as efficient catalysts for two step thermochemical water splitting in conjunction with exceptional hydrogen yields

La1 xcaxmn1 yalyo3 perovskites as efficient catalysts for two step thermochemical water splitting in conjunction with exceptional hydrogen yields Chinese Journal of Catalysis 38 (2017) 1079 1086 催化学报 2017 年第 38 卷第 6 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue on Nanoscience

More information

Novel structured Mo Cu Fe O composite for catalytic air oxidation of dye containing wastewater under ambient temperature and pressure

Novel structured Mo Cu Fe O composite for catalytic air oxidation of dye containing wastewater under ambient temperature and pressure Chinese Journal of Catalysis 38 (217) 1719 1725 催化学报 217 年第 38 卷第 1 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Novel structured Mo Cu Fe

More information

SnO2 based solid solutions for CH4 deep oxidation: Quantifying the lattice capacity of SnO2 using an X ray diffraction extrapolation method

SnO2 based solid solutions for CH4 deep oxidation: Quantifying the lattice capacity of SnO2 using an X ray diffraction extrapolation method Chinese Journal of Catalysis 37 (2016) 1293 1302 催化学报 2016 年第 37 卷第 8 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article SnO2 based solid solutions

More information

Enhanced visible photocatalytic activity of TiO2 hollow boxes modified by methionine for RhB degradation and NO oxidation

Enhanced visible photocatalytic activity of TiO2 hollow boxes modified by methionine for RhB degradation and NO oxidation Chinese Journal of Catalysis 39 (2018) 736 746 催化学报 2018 年第 39 卷第 4 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue on Environmental

More information

NiFe layered double hydroxide nanoparticles for efficiently enhancing performance of BiVO4 photoanode in

NiFe layered double hydroxide nanoparticles for efficiently enhancing performance of BiVO4 photoanode in Chinese Journal of Catalysis 39 (218) 613 618 催化学报 218 年第 39 卷第 4 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Communication (Special Issue on Environmental

More information

上海激光电子伽玛源 (SLEGS) 样机的实验介绍

上海激光电子伽玛源 (SLEGS) 样机的实验介绍 上海激光电子伽玛源 (SLEGS) 样机的实验介绍 Pan Qiangyan for SLEGS collaborators 一. 引言二. 装置布局三. 实验及其结果四. 结论 一, 引言 为建设 SLEGS 光束线提供参考和研制依据, 中科院上海应用物理研究所于 2005 年成立了以徐望研究员为组长的 SLEGS 小组, 开展 SLEGS 样机的实验工作 ; 在中科院知识创新工程方向性项目 (

More information

SiO2 supported Au Ni bimetallic catalyst for the selective hydrogenation of acetylene

SiO2 supported Au Ni bimetallic catalyst for the selective hydrogenation of acetylene Chinese Journal of Catalysis 38 (217) 1338 1346 催化学报 217 年第 38 卷第 8 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article SiO2 supported Au Ni bimetallic

More information

Tuning the growth of Cu MOFs for efficient catalytic hydrolysis of carbonyl sulfide

Tuning the growth of Cu MOFs for efficient catalytic hydrolysis of carbonyl sulfide Chinese Journal of Catalysis 38 (17) 1373 1381 催化学报 17 年第 38 卷第 8 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Tuning the growth of Cu MOFs

More information

Selection of oxide supports to anchor desirable bimetallic structures for ethanol reforming and 1,3 butadiene hydrogenation

Selection of oxide supports to anchor desirable bimetallic structures for ethanol reforming and 1,3 butadiene hydrogenation Chinese Journal of Catalysis () 9 7 催化学报 年第 卷第 期 www.chxb.cn available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Dedicated to Professor Yi Chen on the occasion of

More information

Coating Pd/Al2O3 catalysts with FeOx enhances both activity and selectivity in 1,3 butadiene hydrogenation

Coating Pd/Al2O3 catalysts with FeOx enhances both activity and selectivity in 1,3 butadiene hydrogenation Chinese Journal of Catalysis 38 (17) 1581 1587 催化学报 17 年第 38 卷第 9 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue of the International

More information

Effect of Gd0.2Ce0.8O1.9 nanoparticles on the oxygen evolution reaction of La0.6Sr0.4Co0.2Fe0.8O3 δ anode in solid oxide electrolysis cell

Effect of Gd0.2Ce0.8O1.9 nanoparticles on the oxygen evolution reaction of La0.6Sr0.4Co0.2Fe0.8O3 δ anode in solid oxide electrolysis cell Chinese Journal of Catalysis 39 (2018) 1484 1492 催化学报 2018 年第 39 卷第 9 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Effect of GdCe0.8O1.9

More information

Influence of nickel(ii) oxide surface magnetism on molecule adsorption: A first principles study

Influence of nickel(ii) oxide surface magnetism on molecule adsorption: A first principles study Chinese Journal of Catalysis 38 (2017) 1736 1748 催化学报 2017 年第 38 卷第 10 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Influence of nickel(ii)

More information

Growth of Aligned SWNTs in Quartz Substrates. Jie Liu Department of Chemistry Duke University April 10, 2011 Guadalupe Workshop

Growth of Aligned SWNTs in Quartz Substrates. Jie Liu Department of Chemistry Duke University April 10, 2011 Guadalupe Workshop Growth of Aligned SWNTs in Quartz Substrates Jie Liu Department of Chemistry Duke University April 10, 2011 Guadalupe Workshop Carbon Nanotube Structure θ = tan 1 [ 3m /( m + 2n)] d = 2 ac c 3( n + nm

More information

SUPPLEMENTARY INFORMATION

SUPPLEMENTARY INFORMATION SUPPLEMENTARY INFORMATION Shape-controlled TiO 2 nanoparticles and TiO 2 P25 interacting with CO and H 2 O 2 molecular probes: a synergic approach for surface structure recognition and physico-chemical

More information

Highly photoreactive TiO2 hollow microspheres with super thermal stability for acetone oxidation

Highly photoreactive TiO2 hollow microspheres with super thermal stability for acetone oxidation Chinese Journal of Catalysis 38 (2017) 2085 2093 催化学报 2017 年第 38 卷第 12 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue on Photocatalysis

More information

Preparation of mesoporous Fe-Cu mixed metal oxide nanopowder as active and stable catalyst for low-temperature CO oxidation

Preparation of mesoporous Fe-Cu mixed metal oxide nanopowder as active and stable catalyst for low-temperature CO oxidation Chinese Journal of Catalysis 36 (215) 1711 1718 催化学报 215 年第 36 卷第 1 期 www.chxb.cn available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Preparation of mesoporous Fe-Cu

More information

N doped ordered mesoporous carbon as a multifunctional support of ultrafine Pt nanoparticles for hydrogenation of nitroarenes

N doped ordered mesoporous carbon as a multifunctional support of ultrafine Pt nanoparticles for hydrogenation of nitroarenes Chinese Journal of Catalysis 38 (2017) 1252 1260 催化学报 2017 年第 38 卷第 7 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article N doped ordered mesoporous

More information

Facile preparation of composites for the visible light degradation of organic dyes

Facile preparation of composites for the visible light degradation of organic dyes Chinese Journal of Catalysis 39 (18) 1832 1841 催化学报 18 年第 39 卷第 11 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Facile preparation of sepiolite

More information

Electrocatalytic water oxidation by a nickel oxide film derived from a molecular precursor

Electrocatalytic water oxidation by a nickel oxide film derived from a molecular precursor Chinese Journal of Catalysis 38 (2017) 1812 1817 催化学报 2017 年第 38 卷第 11 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Electrocatalytic water

More information

Biomolecule assisted, cost effective synthesis of a Zn0.9Cd0.1S solid solution for efficient photocatalytic hydrogen production under visible light

Biomolecule assisted, cost effective synthesis of a Zn0.9Cd0.1S solid solution for efficient photocatalytic hydrogen production under visible light Chinese Journal of Catalysis 39 (2018) 495 501 催化学报 2018 年第 39 卷第 3 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue of Photocatalysis

More information

能源化学工程专业培养方案. Undergraduate Program for Specialty in Energy Chemical Engineering 专业负责人 : 何平分管院长 : 廖其龙院学术委员会主任 : 李玉香

能源化学工程专业培养方案. Undergraduate Program for Specialty in Energy Chemical Engineering 专业负责人 : 何平分管院长 : 廖其龙院学术委员会主任 : 李玉香 能源化学工程专业培养方案 Undergraduate Program for Specialty in Energy Chemical Engineering 专业负责人 : 何平分管院长 : 廖其龙院学术委员会主任 : 李玉香 Director of Specialty: He Ping Executive Dean: Liao Qilong Academic Committee Director:

More information

Ho modified Mn Ce/TiO2 for low temperature SCR of NOx with NH3: Evaluation and characterization

Ho modified Mn Ce/TiO2 for low temperature SCR of NOx with NH3: Evaluation and characterization Chinese Journal of Catalysis 39 (2018) 1653 1663 催化学报 2018 年第 39 卷第 10 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Ho modified Mn Ce/TiO2

More information

Low cost and efficient visible light driven microspheres fabricated via an ion exchange route

Low cost and efficient visible light driven microspheres fabricated via an ion exchange route Chinese Journal of Catalysis 38 (2017) 1899 1908 催化学报 2017 年第 38 卷第 11 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Low cost and efficient

More information

Highly enhanced visible-light photocatalytic hydrogen evolution on g-c3n4 decorated with vopc through - interaction

Highly enhanced visible-light photocatalytic hydrogen evolution on g-c3n4 decorated with vopc through - interaction Chinese Journal of Catalysis 4 (219) 168 176 催化学报 219 年第 4 卷第 2 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Highly enhanced visible-light

More information

Effect of acidic promoters on the titania nanotubes supported V2O5 catalysts for the selective oxidation of methanol to dimethoxymethane

Effect of acidic promoters on the titania nanotubes supported V2O5 catalysts for the selective oxidation of methanol to dimethoxymethane Chinese Journal of Catalysis 34 (213) 211 2117 催化学报 213 年第 34 卷第 11 期 www.chxb.cn available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Dedicated to Professor Yi Chen

More information

Anisotropic Dielectric Properties of Short Carbon Fiber Composites. FU Jin-Gang, ZHU Dong-Mei, ZHOU Wan-Cheng, LUO Fa

Anisotropic Dielectric Properties of Short Carbon Fiber Composites. FU Jin-Gang, ZHU Dong-Mei, ZHOU Wan-Cheng, LUO Fa 第 27 卷第 11 期无机材料学报 Vol. 27 No. 11 2012 年 11 月 Journal of Inorganic Materials Nov., 2012 Article ID: 1000-324X(2012)11-1223-05 DOI: 10.3724/SP.J.1077.2012.12364 Anisotropic Dielectric Properties of Short

More information

Surface treatment effect on the photocatalytic hydrogen generation of CdS/ZnS core shell microstructures

Surface treatment effect on the photocatalytic hydrogen generation of CdS/ZnS core shell microstructures hinese Journal of atalysis 38 (217) 489 497 催化学报 217 年第 38 卷第 3 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc rticle Surface treatment effect on the

More information

Hydrothermal synthesis of nanosized ZSM 22 and their use in the catalytic conversion of methanol

Hydrothermal synthesis of nanosized ZSM 22 and their use in the catalytic conversion of methanol Chinese Journal of Catalysis 37 (2016) 1381 1388 催化学报 2016 年第 37 卷第 8 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Hydrothermal synthesis

More information

Highly selective hydrogenation of furfural to tetrahydrofurfuryl alcohol over MIL 101(Cr) NH2 supported Pd catalyst at low temperature

Highly selective hydrogenation of furfural to tetrahydrofurfuryl alcohol over MIL 101(Cr) NH2 supported Pd catalyst at low temperature Chinese Journal of Catalysis 39 (218) 319 326 催化学报 218 年第 39 卷第 2 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Highly selective hydrogenation

More information

Preparation of LaMnO3 for catalytic combustion of vinyl chloride

Preparation of LaMnO3 for catalytic combustion of vinyl chloride Chinese Journal of Catalysis 38 (2017) 1406 1412 催化学报 2017 年第 38 卷第 8 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Preparation of LaMnO3

More information

Enhanced visible light photocatalytic oxidation capability of carbon doped TiO2 via coupling with fly ash

Enhanced visible light photocatalytic oxidation capability of carbon doped TiO2 via coupling with fly ash Chinese Journal of Catalysis 39 (2018) 1890 1900 催化学报 2018 年第 39 卷第 12 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Enhanced visible light

More information

There are only 92 stable elements in nature

There are only 92 stable elements in nature There are only stable elements in nature Jiang Chun-xuan P. O. Box, Beijing 0, P. R. China jcxxxx@.com Abstract Using mathematical method we prove that there are only stable elements in nature and obtain

More information

Synergetic effect between non thermal plasma and photocatalytic oxidation on the degradation of gas phase toluene: Role of ozone

Synergetic effect between non thermal plasma and photocatalytic oxidation on the degradation of gas phase toluene: Role of ozone Chinese Journal of Catalysis 4 (219) 681 69 催化学报 219 年第 4 卷第 5 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Synergetic effect between non

More information

Homogeneous boron doping in a TiO2 shell supported on a TiB2 core for enhanced photocatalytic water oxidation

Homogeneous boron doping in a TiO2 shell supported on a TiB2 core for enhanced photocatalytic water oxidation Chinese Journal of Catalysis 39 (218) 431 437 催化学报 218 年第 39 卷第 3 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue of Photocatalysis

More information

A mini review on carbon based metal free electrocatalysts for

A mini review on carbon based metal free electrocatalysts for Chinese Journal of Catalysis 34 (2013) 1986 1991 催化学报 2013 年第 34 卷第 11 期 www.chxb.cn available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Review (Dedicated to Professor Yi

More information

Catalytic combustion of methane over Pd/SnO2 catalysts

Catalytic combustion of methane over Pd/SnO2 catalysts Chinese Journal of Catalysis 38 (2017) 1322 1329 催化学报 2017 年第 38 卷第 8 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Catalytic combustion of

More information

Two dimensional materials confining single atoms for catalysis

Two dimensional materials confining single atoms for catalysis Chinese Journal of Catalysis 38 (2017) 1443 1453 催化学报 2017 年第 38 卷第 9 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Perspective (Special Issue of

More information

Effect of methanol concentration on oxygen reduction reaction activity of Pt/C catalysts

Effect of methanol concentration on oxygen reduction reaction activity of Pt/C catalysts Chinese Journal of Catalysis 34 (213) 115 1111 催化学报 213 年第 34 卷第 6 期 www.chxb.cn available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Effect of methanol concentration

More information

Promoting effect of polyaniline on Pd catalysts for the formic acid electrooxidation reaction

Promoting effect of polyaniline on Pd catalysts for the formic acid electrooxidation reaction Chinese Journal of Catalysis 6 (5) 94 95 催化学报 5 年第 6 卷第 7 期 www.chxb.cn available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Promoting effect of polyaniline on catalysts

More information

Ultrasonic synthesis of CoO/graphene nanohybrids as high performance anode materials for lithium ion batteries

Ultrasonic synthesis of CoO/graphene nanohybrids as high performance anode materials for lithium ion batteries Trans. Nonferrous Met. Soc. China 22(2012) 2517 2522 Ultrasonic synthesis of CoO/graphene nanohybrids as high performance anode materials for lithium ion batteries CHEN Bing di 1, 2, PENG Cheng xin 1,

More information

available at journal homepage:

available at   journal homepage: Chinese Journal of Catalysis 39 (2018) 401 406 催化学报 2018 年第 39 卷第 3 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Communication (Special Issue of

More information

Cu catalyzed deoxygenative gem hydroborylation of aromatic aldehydes and ketones to access benzylboronic esters

Cu catalyzed deoxygenative gem hydroborylation of aromatic aldehydes and ketones to access benzylboronic esters Chinese Journal of Catalysis 39 (2018) 1725 1729 催化学报 2018 年第 39 卷第 11 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Communication Cu catalyzed deoxygenative

More information

Ionic covalent organic frameworks for highly effective catalysis

Ionic covalent organic frameworks for highly effective catalysis Chinese Journal of Catalysis 39 (2018) 1437 1444 催化学报 2018 年第 39 卷第 9 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Ionic covalent organic

More information

One step synthesis of graphitic carbon nitride nanosheets for efficient catalysis of phenol removal under visible light

One step synthesis of graphitic carbon nitride nanosheets for efficient catalysis of phenol removal under visible light Chinese Journal of Catalysis 38 (217) 1711 1718 催化学报 217 年第 38 卷第 1 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article One step synthesis of graphitic

More information

Rigorous back analysis of shear strength parameters of landslide slip

Rigorous back analysis of shear strength parameters of landslide slip Trans. Nonferrous Met. Soc. China 23(2013) 1459 1464 Rigorous back analysis of shear strength parameters of landslide slip Ke ZHANG 1, Ping CAO 1, Rui BAO 1,2 1. School of Resources and Safety Engineering,

More information

Cobalt nanoparticles encapsulated in nitrogen doped carbon for room temperature selective hydrogenation of nitroarenes

Cobalt nanoparticles encapsulated in nitrogen doped carbon for room temperature selective hydrogenation of nitroarenes Chinese Journal of Catalysis 39 (218) 664 672 催化学报 218 年第 39 卷第 4 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article (Special Issue on Environmental

More information

沙强 / 讲师 随时欢迎对有机化学感兴趣的同学与我交流! 理学院化学系 从事专业 有机化学. 办公室 逸夫楼 6072 实验室 逸夫楼 6081 毕业院校 南京理工大学 电子邮箱 研 究 方 向 催化不对称合成 杂环骨架构建 卡宾化学 生物活性分子设计

沙强 / 讲师 随时欢迎对有机化学感兴趣的同学与我交流! 理学院化学系 从事专业 有机化学. 办公室 逸夫楼 6072 实验室 逸夫楼 6081 毕业院校 南京理工大学 电子邮箱 研 究 方 向 催化不对称合成 杂环骨架构建 卡宾化学 生物活性分子设计 沙强 / 讲师 随时欢迎对有机化学感兴趣的同学与我交流! 院系 理学院化学系 从事专业 有机化学 学历 博士研究生 学位 博士 办公室 逸夫楼 6072 实验室 逸夫楼 6081 毕业院校 南京理工大学 电子邮箱 qsha@njau.edu.cn 研 究 方 向 催化不对称合成 杂环骨架构建 卡宾化学 生物活性分子设计 研究方向汇总图个人简介 2010 年毕业于南京理工大学制药工程专业, 获得工学学士学位,

More information

Yingxu Wei a,b, Dazhi Zhang a, Zhongmin Liu a, *, Bao-Lian Su b, *

Yingxu Wei a,b, Dazhi Zhang a, Zhongmin Liu a, *, Bao-Lian Su b, * Chemical hysics Letters 444 (2007) 197 201 www.elsevier.com/locate/cplett Mechanistic elucidation of chloromethane transformation over SA-34 using deuterated probe molecule: A FTIR study on the surface

More information

Selective reduction of carbon dioxide to carbon monoxide over Au/CeO2 catalyst and identification of reaction intermediate

Selective reduction of carbon dioxide to carbon monoxide over Au/CeO2 catalyst and identification of reaction intermediate Chese Journal of Catalysis 37 (216) 253 258 催化学报 216 年第 37 卷第 12 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Selective reduction of carbon

More information

Bimetallic Cr-In/H-SSZ-13 for selective catalytic reduction of nitric oxide by methane

Bimetallic Cr-In/H-SSZ-13 for selective catalytic reduction of nitric oxide by methane Chinese Journal of Catalysis 39 (18) 4 111 催化学报 18 年第 39 卷第 5 期 www.cjcatal.org available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/chnjc Article Bimetallic Cr-In/H-SSZ-13 for

More information

MASTER S DEGREE THESIS. Electrochemical Stability of Pt-Au alloy Nanoparticles and the Effect of Alloying Element (Au) on the Stability of Pt

MASTER S DEGREE THESIS. Electrochemical Stability of Pt-Au alloy Nanoparticles and the Effect of Alloying Element (Au) on the Stability of Pt Electrochemical Stability of P-Au Nanoparticles and the Name: Amsalu Efrem Yemene Supervisor: Prof.Chen,Bing Hui Effect of alloying Element (Au) on the stability of Pt Xiamen University, China University

More information