Supporting Information. Highly permeable and selective zeolitic imidazolate framework ZIF-95 membrane for hydrogen separation
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1 Supporting Information Highly permeable and selective zeolitic imidazolate framework ZIF-95 membrane for hydrogen separation Aisheng Huang* a, Yifei Chen b, Nanyi Wang c, Zhongqiao Hu b, Jianwen Jiang b and Jürgen Caro * c a Institute of New Energy Technology, Ningbo Institute of Material Technology and Engineering, CAS, 519 Zhuangshi Road, Ningbo, P. R. China. b Department of Chemical and Biomolecular Engineering, National University of Singapore, , Singapore c Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstraße 3-3A, D Hannover, Germany S1
2 Experimental details: Materials: Chemicals were used as received: zinc nitrate tetrahydrate (>99%, Merck), 5- chlorobenzimidazole (cbim, >96%, ABCR), 3-aminopropyltriethoxysilane (APTES, 98%, Abcr), toluene (Acros), N, N-Dimethylformamide (DMF, water<50 ppm, Acros). Porous α-al 2 O 3 disks (Fraunhofer Institute IKTS, former HITK/Inocermic, Hermsdorf, Germany: 18 mm in diameter, 1.0 mm in thickness, 70 nm particles in the top layer) were used as supports. APTES modificaton of the support surface: Porous α-al 2 O 3 disks were treated with APTES (0.2 mm in 10 ml toluene) at 110 C for 2 h under argon, leading to APTES monolayer deposited on the α-al 2 O 3 support surface. 1 Synthesis of ZIF-95 membrane: The ZIF-95 membrane was prepared by a solvothermal reaction of zinc nitrate tetrahydrate and cbimi in DMF according to the previous report. 2 The APTES-treated or APTES-free α-al 2 O 3 supports were placed horizontally in a Teflon-lined stainless steel autoclave which was filled with synthesis solution, and heated at 120 C in air oven for 3 days. After solvothermal reaction, the ZIF-95 membranes were washed with DMF several times, and then dried in air at 100 C over night. Characterization of ZIF-95 membrane: Scanning electron microscopy (SEM) micrographs were taken on a JEOL JSM-6700F with a cold field emission gun operating at 2 kv and 10 µa. using the same SEM microscope at 20 kv and 20 µa. The X-ray diffraction (XRD) patterns were recorded at room temperature under ambient conditions with Bruker D8 ADVANCE X-ray diffractometer with CuKa radiation at 40 kv and 40 ma. Permeation of single gas and separation of mixed gases: For the single gas and mixture gas permeation, the supported ZIF-95 membrane was sealed in a permeation module with silicone O-rings. S2
3 The feed gases were fed to the top side of the membrane, and sweep gas was fed on the permeate side to keep the concentration of permeating gas low providing a driving force for permeation. Before gas permeation, the as-synthesized ZIF-95 membrane was on-stream activated to remove guest DMF at 325 ºC with a heating rate of 0.2 C min -1 by using an equimolar H 2 -CO 2 mixture in the Wicke-Kallenbach permeation apparatus (Figure S2). The activation is completed at 325 ºC for 24 h. and then before measurements of every single gas permeation and mixture separation, the membrane was in-situ heated at 325 C for 24 h under sweep gas to remove the adsorbed CO 2. The sweep gas N 2 (except for the N 2 permeation measurement where CH 4 was used as sweep gas) was fed on the permeate side to keep the concentration of permeating gas as low as possible thus providing a driving force for permeation. On both sides of the membranes was atmospheric pressure. The fluxes of feed and sweep gases were determined with mass flow controllers, and a calibrated gas chromatograph (HP6890) was used to measure the gas concentrations, as shown in Figure S2. The separation factor α i,j of a binary mixture permeation is defined as the quotient of the molar ratios of the components (i,j) in the permeate, divided by the quotient of the molar ratio of the components (i, j) in the retentate, as show in Eq. 1. α i / j = y i, Perm y i,ret / y / y j, Perm j,ret (1) Simulation Models and Methods: The adsorption of H 2 /CO 2 mixture in ZIF-95 was examined by molecular simulation. The model structure of ZIF-95 was adopted from experimentally determined X-ray crystallographic data. 2 To estimate the charges of ZIF-95 framework atoms, a fragmental cluster (Figure S1E) was cleaved and saturated by lithium. The electrostatic potentials around the cluster were calculated by density-functional theory (DFT). It has been widely recognized that first-principles derived charges fluctuate appreciably when a small basis set is used; however, they tend to converge beyond 6-31G(d) basis set. 3 Consequently, 6-31G(d) basis set was used in the DFT calculation for all the atoms except Zn metals, for which LANL2DZ basis set was used with effective pseudopotentials. The DFT calculation used the Lee-Yang-Parr correlation functional (B3LYP) and was carried out with Gaussian The S3
4 concept of atomic charges is solely an approximation and no unique straightforward method is currently available to rigorously determine atomic charges. In this study, the atomic charges were estimated by fitting to the electrostatic potential using the CHelpG scheme. 5 H 1 (0.008) Zn (0.939) C 1 (0.318) N (-0.456) C 2 (0.152) H 2 (0.128) C 3 (-0.233) C 4 (-0.052) C 5 (0.250) H 3 (0.090) Cl (-0.267) Figure S1E. A fragmental cluster of ZIF-95 used to calculate atomic charges. The dangling bonds connected to N were saturated by Li. Color code: Zn, pink; N, blue; C, grey; H, white; Cl, green. The adsorption isotherms of CO 2, CH 4 and N 2 in ZIF-95 were predicted and compared with available experimental data. CO 2 was represented as a three-site molecule and its intrinsic quadrupole moment was described by a partial-charge model. 6 A united-atom model was used for CH 4 with the Lennard-Jones (LJ) potential parameters from the TraPPE force field. 7 N 2 was mimicked by two-site models with a bond length of 1.10 Å. 8 The dispersion interactions of the framework atoms in ZIF-95 were represented by the universal force field (UFF). 9 Similar to recent studies, 10,11 the well depths of the framework atoms were scaled by a factor (0.6). The cross LJ interaction parameters between ZIF-95 and adsorbates were evaluated by the Lorentz-Berthelot combining rules. As shown in Figure S5, the predicted isotherms of CO 2, CH 4 and N 2 match well with experimental data. S4
5 References (1) A. Huang, F. Liang, F. Steinbach, J. Caro, J. Membr. Sci. 2010, 350, 5. (2) B. Wang, A. P. Côté, H. Furukawa, M. O Keeffe, O. M. Yaghi, Nature, 2008, 453, 207. (3) P. C. Hariharan, J. A. Pople, Chem. Phys. Lett. 1972, 16, 217. (4) M. J. Frisch, G. W. Trucks, H. B. Schlegel, G. E. Scuseria, M. A. Robb, J. R. Cheeseman, V. G. Zakrzewski, J. A. Montgomery, R. E. Stratmann, J. C. Burant, S. Dapprich, J. M. Millam, A. D. Daniels, K. N. Kudin, M. C. Strain, O. Farkas, J. Tomasi, V. Barone, M. Cossi, R. Cammi, B. Mennucci, C. Pomelli, C. Adamo, S. Clifford, J. Ochterski, G. A. Petersson, P. Y. Ayala, Q. Cui, K. Morokuma, D. K. Malick, A. D. Rabuck, K. Raghavachari, J. B. Foresman, J. Cioslowski, J. V. Ortiz, B. B. Stefanov, G. Liu, A. Liashenko, P. Piskorz, I. Komaromi, R. Gomperts, R. L. Martin, D. J. Fox, T. Keith, M. A. Al-Laham, C. Y. Peng, A. Nanayakkara, C. Gonzalez, M. Challacombe, P. M. W. Gill, B. G. Johnson, W. Chen, M. W. Wong, J. L. Andres, M. Head-Gordon, E. S. Replogle, J. A. Pople, Gaussian 03, Revision D.01 ed.; Gaussian, Inc.: Wallingford CT, (5) C. M. Breneman, K. B. Wiberg, J. Comp. Chem 1990, 11, 361. (6) A. Hirotani, K. Mizukami, R. Miura,H. Takaba, T. Miya, A. Fahmi, A. Stirling, M. Kubo, A. Miyamoto, Appl. Surf. Sci. 1997, 120, 81. (7) M. G. Martin, J. I. Siepmann, J. Phys. Chem. B. 1998, 102, (8) C. S. Murthy, K. Singer, M. L. Klein, I. R. McDonald, Mol. Phys. 1980, 41, (9) A. K. Rappe, C. J. Casewit, K. S. Colwell, W. A. Goddard, W. M. Skiff, J. Am. Chem. Soc. 1992, 114, (10) J. Perez-Pellitero, H. Amrouche, F. R. Siperstein, G. Pirngruber, C. Nieto-Draghi, G. Chaplais, A. Simon-Masseron, D. Bazer-Bachi, D. Perala, N. Bats, Chem. Eur. J. 2010, 16, (11) A. Battisti, S. Taioli, G. Garberoglio, Microporous and Mesoporous Mater. 2011, 143, 46. S5
6 Electronic Supplementary Material (ESI) for Chemical Communications Figure S1 H2 CO2 ZIF-95 layer Al2O3 support Fig. S1. Scheme of the fabrication of ZIF-95 molecular sieve membrane as carbon dioxide captor for H2/CO2 separation. S6
7 Electronic Supplementary Material (ESI) for Chemical Communications Figure S2 (a) (b) 100 µm (c) 25 µm (d) ZIF-95 layer Al2O3 support 10 µm 10 µm Figure S2. SEM images of the ZIF-95 membrane prepared on the APTESmodified asymmetric macroporous α-al2o3 disk: (a-c) top views, (d) crosssection. The circle in (c) indicates the folded filters structure. S7
8 Electronic Supplementary Material (ESI) for Chemical Communications Figure S3 Fig. S3. SEM image of the ZIF-95 layer prepared on the nonaptes-modified Al2O3 support. S8
9 Figure S4 MFC MFC f feed, p feed f retentate, p retentate PC MFC f sweep, p sweep f permeate, p permeate GC Fig. S4. Measurement equipment for both single and mixed gas permeation. Legend: MFC: mass flow controller PC: permeation cell with mounted membrane GC: gas chromatograph f: volumetric flow rate p: pressure S9
10 Figure S Simulated CO 2 Experimental CO 2 Simulated CH 4 Uptake (m mol /g) Experimental CH 4 Simulated N 2 Experimental N 2 Simulated H Pressure (Torr) Fig. S5. The comparison of the experimental and simulated adsorption isotherms of CO 2, CH 4 and N 2 in ZIF-95 at 25 C. S10
11 Figure S6 0.6 CO H 2 Uptake (m mol /g) Pressure (Torr) Fig. S6. The simulated adsorption isotherms of equimolar H 2 /CO 2 mixture in ZIF-95 at 25 C. S11
12 Figure S7 Permeance / mol m -2 s -1 Pa x x x x x x x x x x H 2 permeance CO 28 2 permeance Separation factor Mixture separation factor Temperature / ο C Fig. S7. Mixed gas permeances and H 2 /CO 2 selectivity of the ZIF-95 membrane as function of the operating temperatures at 1 bar. S12
13 Figure S8 1.0 Uptake (m mol /g) ο C 125 ο C 225 ο C 325 ο C Pressure (Torr) Fig. S8. The adsorption isotherms of CO 2 in ZIF-95 as function of the operating temperature. S13
14 Figure S9 2.4x x Permeance / mol m -2 s -1 Pa x x x x10-7 H 2 permeance CO 2 permeance Separation factor Mixture separation factor Time / h 20 Fig. S9. Mixed gas permeances and H 2 /CO 2 selectivity of the ZIF-95 membrane as function of the operating time at 325 C and 1 bar. S14
15 Figure S10 Intensity (b) (a) θ/degrees Fig. S10. XRD patterns of the as-prepared ZIF-95 membrane prepared on the APTES-modified α-al 2 O 3 support (a), and the spent ZIF-95 membrane after the measurement of gas separation at 325 C. ( ): Al 2 O 3 support, (not marked): ZIF-95. S15
16 Figure S11 Permeance / mol m -2 s -1 Pa x x x x x x x x x x H 2 permeance CO 2 permeance Separation factor Time / h Mixture separation factor Fig. S11. Hydrothermal stability measurement of the ZIF-95 membrane for the separation of an equimolar H 2 /CO 2 mixture with adding of 3 mol% steam at 325 C. S16
17 Table S1 Single and mixed gases permeances (mol/m 2 s 1 Pa 1 ) and separation factors for the ZIF-95 membrane at 325 ºC and 1 bar with 1:1 binary mixtures of H 2 with CO 2, N 2, CH 4 and C 3 H 8. Separation performances of the ZIF-95 membrane Gas i/j Knudsen constant Single gas Mixed gases Permeances(i) (mol/m 2 S 1 Pa 1 ) Permeances(j) (mol/m 2 S 1 Pa 1 ) Ideal Separation factor Permeances(i) (mol/m 2 S 1 Pa 1 ) Permeances(j) (mol/m 2 S 1 Pa 1 ) Separation factor H 2 /CO x x x x H 2 /N x x x x H 2 /CH x x x x H 2 /C 3 H x x x x S17
18 Table S2. Comparation of H 2 /CO 2 selectivity versus H 2 permeability for ZIF-95 membrane with the previously reported MOF membranes. ZIF membranes Pore size (nm) Thickness (µm) H 2 permeances (mol/m 2 S 1 Pa 1 ) H 2 permeability* (Barrers) H 2 /CO 2 selectivity References ZIF x ZIF x ZIF x ZIF x ZIF x MIL X x KUUST x ZIF x This study * Permeability is calculated as the membrane permeance multiplied by the membrane thickness. 1 Barrer = mol m / (m 2 s Pa). Reference (1) Y. Li, F. Liang, H. Bux, A. Feldhoff, W. Yang, J. Caro, Angew. Chem. Int. Ed. 2010, 49, 548. (2) H. Bux, F. Liang, Y. Li, J. Cravillon, M. Wiebcke, J. Caro, J. Am. Chem. Soc. 2009, 131, (3) A. Huang, H. Bux, F. Steinbach, J. Caro, Angew. Chem. Int. Ed. 2010, 49, (4) Y. Liu, E. Hu, E. A. Khan, Z. Lai, J. Membr. Sci. 2010, 353, 36. (5) A. Huang, W. Dou, J. Caro, J. Am. Chem. Soc. 2010, 132, (6) Y. Hu, X. Dong,J. Nan, W. Jin, X. Ren, N. Xu, Y. M. Lee, Chem. Commun. 2011, 47, 737. (7) H. Guo, G. Zhu, I. J. Hewitt, S. Qiu, J. Am. Chem. Soc. 2009, 131, S18
19 Table S3. Separation performances of ZIF-95 membranes for the separation of H 2 /CO 2 mixtures at 25 ºC and 1 bar. Membrane H 2 permeance (mol m -2 s -1 Pa -1 ) CO 2 permeance (mol m -2 s -1 Pa -1 ) H 2 /CO 2 selectivity M x x Average selectivity standard deviation of selectivity M x x M x x S19
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