Journal
ACS CATALYSIS
Volume 8, Issue 9, Pages 7787-7798Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b00834
Keywords
syngas chemistry; Fischer-Tropsch synthesis; cobalt catalyst; phase effect; CO dissociation; Wulff construction
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Funding
- NSFC
- China Petrochemical Corporation [U1463210]
- Fundamental Research Funds for the Central Universities, South-Central University for Nationalities [CZW15099, CZP17028, CZP17065]
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences (SC) and Division of Chemical Sciences [DE-FG02-05ER15712]
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In order to understand the role of Co catalysts with different phases on Fischer-Tropsch synthesis, single-phase face-centered-cubic (fcc) and hexagonal-close-packed (hcp) Co were synthesized via a two-step approach, involving the formation of single-phase CoO materials followed by reduction in H-2. The physicochemical properties of Co catalysts were thoroughly characterized by XRD, SEM, TEM, TPR, and H-2 chemisorption. It was found that hcp-Co exhibits higher activity on hydrocarbon formation than fcc-Co in Fischer-Tropsch synthesis. For both catalysts, CO dissociation was suggested as the rate-determining step, on which hcp-Co presents ca. 40 kJ mol(-1) lower activation energy than fcc-Co, in agreement with a reported computational study. As a result, hcp-Co is concluded to be the preferable phase for rational catalyst design.
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