First-Principles Study of Structure Sensitivity of Chain Growth and. Selectivity in Fischer-Tropsch Synthesis on HCP Cobalt Catalysts

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1 Electronic Supplementary Material (ESI) for Catalysis Science & Technology. This journal is The Royal Society of Chemistry 2017 Supporting Information First-Principles Study of Structure Sensitivity of Chain Growth and Selectivity in Fischer-Tropsch Synthesis on HCP Cobalt Catalysts Hai-Yan Su a, Yong-Hui Zhao b, Jin-Xun Liu a, Keju Sun c,* and Wei-Xue Li a,d,* a State Key Laboratory of Molecular Reaction Dynamics, State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian , China b CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Science, Shanghai , China c Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao , China d Department of Chemical Physics, College of Chemistry and Materials Science, Hefei National Laboratory for Physical Sciences at the Microscale, ichem, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei , China * wxli70@ustc.edu.cn; kjsun@ysu.edu.cn S1. Optimized configurations for various intermediates adsorption on Co (0001), stepped Co and Co (101 1) 1 S2. Optimized configurations at the transition states of various elementary reactions on Co (0001), stepped Co and Co (101 1) 3 S3. Adsorption energies and sites of various intermediates and activation energies, reaction heat and geometric information at the transition states of various elementary reactions on Co (0001), stepped Co and Co (101 1) 5 0

2 S1. Optimized configurations for various intermediates adsorption on Co (0001), stepped Co and Co ( ) Figure S1. Optimized configurations for (A) CH (B) CH 2 (C) CH 3 (D) CH 4 (E) CC (F) CCH (G) CCH 2 (H) CHCH (I) CCH 3 (J) CHCH 2 (K) CHCH 3 (L) CH 2 CH 2 (M) CH 2 CH 3 (N) HCO (O) CCO (P) CHCO (Q) CHCHO (R) CHCOH (S) CH 2 CO (T) CHCH 2 O (U) CHCHOH (V) CH 2 CHO (W) CH 2 COH (X) CH 3 CO (Y) CHCH 2 OH (Z) CH 2 CH 2 O (A 1 ) CH 2 CHOH (B 1 ) CH 3 CHO (C 1 ) CH 3 COH (D 1 ) CH 2 CH 2 OH (E 1 ) CH 3 CHOH (F 1 ) CH 3 CH 2 O (G 1 ) CH 3 CH 2 OH adsorption on Co (0001). The blue, grey, red and white balls represent Co, C, O and H atom, respectively. 1

3 Stepped Co Co (101 1) Figure S2. Optimized configurations for (A) CH (B) CH 2 (C) CH 3 (D) CH 4 (E) CC (F) CCH (G) CCH 2 (H) CHCH (I) CCH 3 (J) CHCH 2 (K) CHCH 3 (L) CH 2 CH 2 (M) CH 2 CH 3 (N) HCO/CCO (O) CCO/CHCO (P) CHCO/CHCHO (Q) CHCHO/CHCOH (R) CHCOH/CH 2 CO (S) CH 2 CO/CH 2 CHO (T) CHCH 2 O/CH 3 CO (U) CHCHOH/CH 3 CHO (V) CH 2 CHO (W) CH 2 COH (X) CH 3 CO (Y) CHCH 2 OH (Z) CH 2 CH 2 O (A 1 ) CH 2 CHOH (B 1 ) CH 3 CHO (C 1 ) CH 3 COH (D 1 ) CH 2 CH 2 OH (E 1 ) CH 3 CHOH (F 1 ) CH 3 CH 2 O (G 1 ) CH 3 CH 2 OH adsorption on the stepped Co and Co (101 1). From (N) on, the former/latter structure represents that on stepped Co and Co (101 1), respectively. The blue, dark yellow, grey, red and white balls represent upper Co, lower Co, C, O and H atom, respectively. 2

4 S2. Optimized configurations at the transition states of various elementary reactions on Co (0001), stepped Co and Co ( ) Co (0001) Stepped Co Co (101 1) Figure S3. Optimized configurations at the transition states of (A) C+C (B) C+CH (C) C+CH 2 (D) CH+CH (E) C+CH 3 (F) CH+CH 2 (G) CH+CH 3 (H) CH 2 +CH 2 (I) CH 2 +CH 3 (J) CH+CO (K) CH 2 +CO (L) CH 3 +CO on Co (0001), stepped Co and Co (101 1). 3

5 Co (0001) Stepped Co Co (101 1) Figure S4. Optimized configurations at the transition states of (A) C+H (B) CH+H (C) CH 2 +H (D) CH 3 +H (E) CO+H HCO (F) Co (0001): CHCO+H CHCHO; stepped Co: CHC+H CHCH (G) CHCO+H CH 2 CO (H) CH 2 CO+H CH 3 CO (I) CH 3 CO+H CH 3 CHO on Co (0001), stepped Co and Co (101 1). Figure S5. Optimized configurations at the transition states of (A) CO+H HCO (B) CH+H (C) CH 2 +H (D) CH+CO (E) CHCO+H CHCHO (F) CH 3 CO CH 3 C+O at a constant C coverage of 7/12 ML on Co (0001). 4

6 S3. Adsorption energies and sites of various intermediates and activation energies, reaction heat and geometric information at the transition states of various elementary reactions on Co (0001), stepped Co and Co ( ) Table S1. Calculated adsorption energies (E ADS, in ev) and favorable adsorption sites of various intermediates on Co (0001), stepped Co and Co (101 1). The order of C atom in Site corresponds to that in Species unless α or β-c is indicated. Species (0001) Step (101 1) E ADS Site E ADS Site E ADS Site H fcc hcp fcc O hcp hcp four-fold C hcp four-fold four-fold CO hcp hcp four-fold HCO C bri -O bri C hcp -O bri CH hcp four-fold four-fold CH hcp hcp four-fold CH fcc bri fcc CH top top four-fold CCO C hcp -C bri C four-fold -C top C four-fold -C bri CHCO C fcc -C hcp C fcc -C bri -O bri C hcp -C bri -O bri CH 2 CO C top -C bri -O top C top -C bri -O bri C top -C bri -O bri CHCHO C bri -C top -O bri C fcc -O top βc hcp -O bri CHCOH C hcp -C fcc C hcp -C fcc C bri -C bri CHCHOH βc hcp βc hcp CH 3 CO αc top -O top αc top -O top αc bri -O bri CH 2 CHO C top -C top -O bri C top -C top -O bri C top -C bri -O bri CH 2 COH C bri -C bri C top -C hcp CHCH 2 OH βc hcp βc fcc 5

7 CH 2 CHOH C fcc -C top C top -C top CH 3 COH αc top αc top CH 3 CHO αc bri -O bri αc top -O bri αc bri -O bri CH 2 CH 2 OH βc fcc βc bri CH 3 CH 2 O O hcp O hcp CH 3 CHOH αc top αc top CH 3 CH 2 OH O top O top CC C fcc -C hcp C fcc -C hcp C four-fold -C hcp CHC C fcc -C hcp C bri -C four-fold C bri -C four-fold CH 2 C C hcp C top -C four-fold C bri -C four-fold CHCH C fcc -C hcp C fcc -C hcp C fcc -C hcp CH 3 C C hcp C four-fold C four-fold CH 2 CH C top -C hcp C top -C hcp C bri -C bri CH 3 CH C hcp C hcp C fcc CH 2 CH C top -C hcp C bri -C bri C bri -C bri CH 3 CH C hcp C bri C fcc CH 3 CH C top -C hcp C top C top -C hcp 6

8 Table S2. Calculated activation energies (E ACT in ev), reaction heat (ΔH in ev) and geometric information (d in Å) at the TSs for various elementary reactions on Co (0001), stepped Co and Co (101 1). ΔH is calculated with respected to separate adsorbed states. E ACT in parentheses is with respected to adsorbed CH+CH, C+C and C+C on the three surfaces, respectively. Reactions (0001) Step (101 1) E ACT ΔH d E ACT ΔH d E ACT ΔH d C-O bond scission steps CO C+O HCO CH+O CCO CC+O CHCO CHC+O CHCOH CHC+OH CHCHO CHCH+O CH2CO CH2C+O CH2CHO CH2CH+O CH3CO CH3C + O CH3CHO CH3CH+O C-C coupling steps CH+CO CHCO CH2+CO CH2CO CH3+CO CH3CO C+C CC 1.30(1.94) (1.78) (2.24) C+CH CCH 0.83(1.15) (1.46) (1.65) C+CH2 CCH2 0.76(1.40) (1.39) (2.31) C+CH3 CCH3 0.96(1.44) (1.34) (2.25) CH+CH CHCH 0.68(0.68) (1.35) (1.88) CH+CH2 CHCH2 0.66(0.97) (1.97) (2.60) CH+CH3 CHCH3 1.06(1.22) (1.84) (2.90)

9 CH2+CH2 CH2CH2 0.41(1.04) (1.58) (2.87) CH2+CH3 CH2CH3 0.95(1.42) (1.85) (3.35) Hydrogenation steps CO+H HCO CHCO+H CHCHO CHCO+H CH2CO CH2CO+H CH3CO CH3CO+H CH3CHO C+H CH CH+H CH CH2+H CH CH3+H CH CHC+H CHCH

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