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Title: Cobalt nanoparticles confined in carbon matrix for probing the size dependence in Fischer-Tropsch synthesis

Abstract

The size effect of the metallic Co (Co 0) over supported catalysts for Fischer-Tropsch synthesis (FTS) has imposed great importance for developing a high-performance catalyst. However, the lack of well-structured catalysts makes the clarification of the intrinsic size-dependence of Co 0 still a challenge. In this work, the Co/C catalysts with Co 0 particles from 8.4 ± 1.9 to 74.8 ± 11.6 nm were synthesized by well-controlled pyrolysis of ZIF-67. Based on different characterizations, Co/C catalysts via pyrolyzing ZIF-67 above 450 °C were confirmed as Co0 entrapped in partially graphitized carbon matrix polished by a certain amount of pyridinic and graphitic N and a small portion of adsorbed oxygen. Without the limitation of high-temperature reduction and the dispersion-reducibility dependence, the intrinsic size effect of Co 0 on the activity and product selectivity of FTS was rigorously revealed, and the critical size was determined to be 10.5 ± 1.9 nm.

Authors:
ORCiD logo [1];  [1];  [2];  [3]; ORCiD logo [1];  [1]
  1. Shaanxi Normal Univ., Xi’an (China). Key Lab. of Applied Surface and Colloid Chemistry (MOE), School of Chemistry and Chemical Engineering
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Dept.
  3. Univ. of Science and Technology of China, Hefei (China). National Synchrotron Radiation Lab.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1507698
Report Number(s):
BNL-211560-2019-JAAM
Journal ID: ISSN 0021-9517
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 369; Journal Issue: C; Journal ID: ISSN 0021-9517
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; Fischer-Tropsch synthesis; Synthesis gas; Product distribution; Cobalt; Size effect; Porous carbon

Citation Formats

Luo, Qun-Xing, Guo, Li-Peng, Yao, Si-Yu, Bao, Jun, Liu, Zhao-Tie, and Liu, Zhong-Wen. Cobalt nanoparticles confined in carbon matrix for probing the size dependence in Fischer-Tropsch synthesis. United States: N. p., 2019. Web. doi:10.1016/j.jcat.2018.11.002.
Luo, Qun-Xing, Guo, Li-Peng, Yao, Si-Yu, Bao, Jun, Liu, Zhao-Tie, & Liu, Zhong-Wen. Cobalt nanoparticles confined in carbon matrix for probing the size dependence in Fischer-Tropsch synthesis. United States. doi:10.1016/j.jcat.2018.11.002.
Luo, Qun-Xing, Guo, Li-Peng, Yao, Si-Yu, Bao, Jun, Liu, Zhao-Tie, and Liu, Zhong-Wen. Sat . "Cobalt nanoparticles confined in carbon matrix for probing the size dependence in Fischer-Tropsch synthesis". United States. doi:10.1016/j.jcat.2018.11.002.
@article{osti_1507698,
title = {Cobalt nanoparticles confined in carbon matrix for probing the size dependence in Fischer-Tropsch synthesis},
author = {Luo, Qun-Xing and Guo, Li-Peng and Yao, Si-Yu and Bao, Jun and Liu, Zhao-Tie and Liu, Zhong-Wen},
abstractNote = {The size effect of the metallic Co (Co0) over supported catalysts for Fischer-Tropsch synthesis (FTS) has imposed great importance for developing a high-performance catalyst. However, the lack of well-structured catalysts makes the clarification of the intrinsic size-dependence of Co0 still a challenge. In this work, the Co/C catalysts with Co0 particles from 8.4 ± 1.9 to 74.8 ± 11.6 nm were synthesized by well-controlled pyrolysis of ZIF-67. Based on different characterizations, Co/C catalysts via pyrolyzing ZIF-67 above 450 °C were confirmed as Co0 entrapped in partially graphitized carbon matrix polished by a certain amount of pyridinic and graphitic N and a small portion of adsorbed oxygen. Without the limitation of high-temperature reduction and the dispersion-reducibility dependence, the intrinsic size effect of Co0 on the activity and product selectivity of FTS was rigorously revealed, and the critical size was determined to be 10.5 ± 1.9 nm.},
doi = {10.1016/j.jcat.2018.11.002},
journal = {Journal of Catalysis},
number = C,
volume = 369,
place = {United States},
year = {2019},
month = {11}
}

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This content will become publicly available on November 16, 2020
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