Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 9, Issue 4, Pages 1013-1020Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8cy02420k
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Funding
- NSFC [U1463210]
- China Petrochemical Corporation [U1463210]
- Natural Science Foundation of Hubei Province of China [2013CFB454]
- Fundamental Research Funds for the Central Universities, South-Central University for Nationalities [CZW15099, CZP 17028, CZP17065]
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A pseudo-in situ research method was applied to provide insight into the structural evolution of carbon in an Fe@C catalyst at different stages of the Fischer-Tropsch reaction. Five typical stages of the catalyst were selected for in-depth structural investigation; these were: the fresh catalyst, reduced catalyst, and catalyst in the stable conversion period, in an increased-conversion period and at the inactivation stage. The results indicated that the integral structure of Fe@C constantly changed in the Fischer-Tropsch reaction. Iron carbide transformed from the Fe phase that was easily oxidized under high temperature Fischer-Tropsch conditions, and the carbon framework was completely destroyed in the reaction process, leading to a drastic decrease in the specific surface area of the material. This destruction could have two opposing effects: on the one hand, the loss of carbon could re-expose the active sites that have been covered by carbon at a reaction temperature of 320 degrees C and favor the reaction; on the other hand, the deposition of carbon could block the active sites and lead to inactivation when the reaction temperature is over 340 degrees C.
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