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

Journal Article · · Journal of Catalysis
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.

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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1507698
Report Number(s):
BNL-211560-2019-JAAM
Journal Information:
Journal of Catalysis, Vol. 369, Issue C; ISSN 0021-9517
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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