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1 Supporting Informtion Ultrfst nd Stble CO Cpture Using Alkli Metl SltPromoted MgOCCO 3 Sorbents Hongjie Cui, Qiming Zhng, Yunwu Hu, Chong Peng, Xingchen Fng, Zhenmin Cheng, Vldimir V. Glvit nd Zhiming Zhou, * Stte Key Lbortory of Chemicl Engineering, Est Chin University of Science nd Technology, Shnghi 0037, Chin. Dlin Reserch Institute of Petroleum nd Petrochemicls, SINOPEC, Dlin 0, Chin. Lbortory for Chemicl Technology, Ghent University, Technologieprk 9, B90 Gent, Belgium. *Corresponding uthor: S
2 . Supplementry Text The texturl properties such s pore size distribution, BET surfce re of supports nd sorbents were determined from N dsorption isotherms t 9 C (Micromeritics ASAP 00). The pore volume nd verged pore dimeter were determined from the dsorption brnch using the Brrett JoynerHlend (BJH) method. The micromorphology of supports nd sorbents ws nlyzed by field emission scnning electron microscopy (FESEM, Nov NnoSEM 0) nd highresolution trnsmission electron microscopy (HRTEM, JEOL JEM00) equipped with n energy dispersive spectrometer (EDS, EDAX Genesis XM system). The crystlline structure of the sorbent ws identified by Xry diffrction (XRD, Bruker D8 Advnce) in the rnge of θ = 080 using Cu Kα rdition (λ = 0.8 nm) t room temperture. The in situ XRD study on the CO sorption on the sorbents nd the reverse desorption process ws performed on the Bruker D8 Advnce diffrctometer equipped with hightemperture ttchment (Anton Pr XRK 900). In order to rpidly collect sufficient counts, three seprte scns for θ = 303, 30 nd 0 were recorded with scn step of 0.0 nd step time of 0.3 s. Thus, it took 7 s to obtin n XRD pttern with θ vlues rnging from 30 to by combintion of the three scns. In typicl procedure, the temperture ws first incresed from room temperture to 30 C t heting rte of 0 C/min under N (0 ml/min), fter which N ws switched to CO (0 ml min  ) for sorption nd t the sme time, XRD scns of durtion min (7 s for scnning nd s between ech scn) were registered in the θ rnge of After 0 min of CO sorption t 30 C, CO ws switched bck to N for desorption nd the temperture ws incresed t rte of 0 C min  to 00 C nd kept for 0 min. The diffrction ptterns in the θ rnge of 303 were collected t 30, 370, 380, 390 nd 00 C, respectively. By repeting the bove procedure but with different θ rnges (30 nd 0 ), the corresponding diffrction ptterns were cquired. In ddition, nother in situ XRD experiment ws crried out, in which the temperture ws incresed from room temperture to 00 C t heting rte of 0 C min  under N (0 ml min  ) S
3 while the diffrctogrms were collected ech 0 C t constnt temperture in the θ rnge of 080 with scn step of 0.0 nd step time of 0.3 s. S3
4 . Supporting Tbles Tble S. Texturl Properties of the MgObsed Supports Support MgO content [mol% / wt%] CCO 3 content [mol% / wt%] BET surfce re [m g  ] Pore volume b [cm 3 g  ] Averge pore dimeter b [nm] Mg / Mg 98 C 98 / 9. / Mg 9 9 / 88. / Mg 90 C 0 90 / / Mg(B) / Mg(B) 9 9 / 88. / Referring to the nominl content, but indeed lso representing the ctul content becuse no opertions tht my result in the loss of species were performed during the preprtion process. b Determined from the dsorption brnch using the BrrettJoynerHlend (BJH) method. Tble S. Estimted Kinetic Prmeters for AMSMg 00 nd AMSMg 9 Sorbent T [ C] k [min  ] k [min  ] R AMSMg AMSMg S
5 3. Supporting Figures Volume dsorbed (cm 3 g  ) Mg 00 Mg 98 C Mg 9 Mg 90 C 0 dv/dd (cm 3 (gnm)  ) b Mg 00 Mg 98 C Mg 9 Mg 90 C Reltive pressure Pore dimeter (nm) Figure S. () N dsorptiondesorption isotherms nd (b) poresize distribution (PSD) curves of MgO (Mg 00 ) nd MgOCCO 3 (Mg 98 C, Mg 9 nd Mg 90 C 0 ), showing unimodl PSD for MgO nd bimodl PSD for CCO 3 dopnt MgO. The PSD ws determined from the dsorption brnch using the BrrettJoynerHlend (BJH) method. Volume dsorbed (cm 3 g  ) AMSMg 00 AMSMg 98 C AMSMg 9 AMSMg 90 C 0 dv/dd (cm 3 (gnm)  ) b AMSMg 00 AMSMg 98 C AMSMg 9 AMSMg 90 C Reltive pressure Pore dimeter (nm) Figure S. () N dsorptiondesorption isotherms nd (b) poresize distribution curves of different AMSMgO sorbents, showing unimodl PSD for AMSMgO nd bimodl PSD for CCO 3 dopnt AMSMgO. The PSD ws determined from the dsorption brnch using the BrrettJoynerHlend (BJH) method. S
6 , MgO; MgCO 3 3N Mg(CO 3 ) ; K Mg(CO 3 ) 3 00 C min 00 C min 00 C 390 C 380 C 370 C 30 C 30 C θ (degree), b MgO; MgCO 3 3N Mg(CO 3 ) ; K Mg(CO 3 ) CMg(CO 3 ) ; CCO 3, 3, 00 C 8min 00 C min 00 C min 00 C min 00 C 390 C 380 C 370 C 30 C 30 C θ (degree) Figure S3. Diffrctogrms recorded by insitu XRD nlysis during regenertion of () AMSMg 00 nd (b) AMSMg 9 from 30 to 00 C in pure N. S
7 , MgO; N CO 3 ; 3K CO 3 ; KNO θ (degree) 00 C 0 C 00 C 30 C 300 C 0 C 00 C 0 C 00 C θ (degree) 00 o C 00 o C 300 o C 00 o C 00 o C b,, MgO; N CO 3 ; 3K CO 3 ; KNO 3 ; CCO θ (degree) 00 C 0 C 00 C 30 C 300 C 0 C 00 C 0 C 00 C 00 o C 00 o C 300 o C 00 o C 00 o C θ (degree) Figure S. Diffrctogrms recorded by insitu XRD nlysis of () AMSMg 00 nd (b) AMSMg 9 when heting from 00 to 00 C in pure N. There exists slight shift of the MgO (00) pek to lower ngles with incresing the temperture, i.e., bout 0. for AMSMg 00 nd 0. for AMSMg 00, indicting the lttice expnsion tht origintes from the prtil dissolution of MgO in the molten AMS. S7
8 00 Weight percentge (wt%) µm 30 o C Temperture ( o C) Figure S. Thermogrvimetric nlysis of AMS (with composition the sme s tht used for the sorbents) in N (inset: FESEM imge of AMS fter clcintion t 30 C in N, displying smooth surfce). This Figure indictes tht the initil decomposition temperture of AMS is bout 30 C, i.e., the AMS is stble t the tempertures used in this study ( 00 C) b CO uptke (g CO g sorbent  ) o C 300 o C 3 o C 30 o C 37 o C CO uptke (g CO g sorbent  ) o C 300 o C 3 o C 30 o C 37 o C Time / min Time / min Figure S. CO uptke of () AMSMg 00 nd (b) AMSMg 9 t temperture rnging from 7 to 37 C under pure CO, indicting tht the optiml sorption temperture of AMSMg 00 is 3 C, which is lower thn tht of AMSMg 9 (30 C). S8
9 0 AMSMg 9 E, =.8 kj/mol  AMSMg 00 E, =.9 kj/mol ln(k)  AMSMg 93 AMSMg 00 E, =.9 kj/mol  E, =.8 kj/mol .x03.7x03.7x03.8x03.8x03.9x03 /T (K  ) Figure S7. Activtion energies (E, nd E, ) corresponding to k nd k using the Arrhenius eqution for AMS Mg 00 nd AMSMg 9..0 AMSMg 00 CO uptke (g CO g sorbent  ) AMSMg 98 C AMSMg 9 AMSMg 90 C 0 70 o C Temperture ( o C) Figure S8. Sorption behviors of AMSpromoted MgObsed sorbents by temperture rmping t C min  from 00 to 00 C in pure CO. It shows tht the strting desorption temperture in CO for sturted sorbents is bout 70 C, bsed on which the desorption temperture used in this study under the severe condition is set t 00 C. S9
10 () fresh sorbents 3,3  MgO;  CCO 3 3 N CO 3 ;  K CO 3  KNO 3 Intensity (.u.) AMSMg(B) 9 (b) used sorbents, AMSMg(B) 80 C 0  MgCO 3 ; 7 CMg(CO 3 ) 8 N Mg(CO 3 ) ; 9 K Mg(CO 3 ) AMSMg(B) AMSMg(B) C θ (degree) Figure S9. XRD ptterns of AMSMg(B) 9 nd AMSMg(B) 80 C 0 : () fresh sorbents nd (b) fter sorption in pure CO t 30 C for min. Volume dsorbed (cm 3 g  ) Mg(B) 00 Mg(B) 9 AMSMg(B) 9 dv/dd (cm 3 (gnm)  ) b Mg(B) 00 Mg(B) 9 AMSMg(B) Reltive pressure Pore dimeter (nm) Figure S0. () N dsorptiondesorption isotherms nd (b) poresize distribution (PSD) curves of Mg(B) 00, Mg(B) 9 nd AMS Mg(B) 9, showing unimodl PSD of support nd sorbent prepred by simple method with bsic mgnesium crbonte s the MgO precursor. The PSD ws determined from the dsorption brnch using the BrrettJoynerHlend (BJH) method. S0
11 CO uptke (g CO g sorbent  ) b AMSMg(B) 9 AMSMg(B) 80 C Time (min) c fresh d fter 0 cycles µm µm Figure S. CO uptke profiles of AMSMg(B) 80 C 0 : () over 0 cycles under severe condition nd (b) comprison with AMSMg(B) 9 t the first cycle. FESEM imges of (c) fresh AMSMg(B) 80 C 0 nd (d) 0 cycle used AMSMg(B) 80 C 0 under severe condition. S
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