The role of SiOxCy in the catalytic performance of Co/SiC catalysts for Fischer-Tropsch synthesis

[Display omitted] •The content of SiOxCy on SiC surface decreased after nitric acid treatment.•SiOxCy had great effect on the electron density and reduction degree of cobalt species.•The decrease of SiOxCy on SiC surface allowed a significant improvement of the C5+ selectivity of Co/SiC catalysts. C...

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Bibliographic Details
Published in:Fuel (Guildford) 2019-04, Vol.241, p.669-675
Main Authors: Wang, Min, Guo, Shupeng, Li, Zhiwen, Ma, Zhongyi, Wang, Jungang, Hou, Bo, Jia, Litao, Li, Debao
Format: Article
Language:English
Subjects:
Catalysis
Catalyst
Catalysts
Chemical synthesis
Chemisorption
Cobalt
Electron density
Electronegativity
Fischer-Tropsch process
Fischer-Tropsch synthesis
Nitric acid
Organic chemistry
Selectivity
Shells
SiC
Silicon carbide
SiOxCy
X ray photoelectron spectroscopy
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Summary:[Display omitted] •The content of SiOxCy on SiC surface decreased after nitric acid treatment.•SiOxCy had great effect on the electron density and reduction degree of cobalt species.•The decrease of SiOxCy on SiC surface allowed a significant improvement of the C5+ selectivity of Co/SiC catalysts. Co/SiC catalysts were prepared to investigate the role of SiOxCy on SiC surface in the catalytic performance for Fischer–Tropsch synthesis. SiC was pretreated by nitric acid with different concentration, and the Co/SiC catalysts were prepared and characterized by N2-adsorption, H2-chemisorption, XRD, TPR, TPO, XPS, and TEM. It was found that the decrease of SiOxCy caused by nitric acid treatment may be related to the increase of reducibility of Co/SiC catalysts and the decrease of binding energy of cobalt. The catalytic performance revealed that the less the content of SiOxCy was, the higher the selectivity of long chain hydrocarbon was. It was concluded that the strong electronegativity of SiOxCy had great effect on the electron density of cobalt species and then on the catalytic performance of the Co/SiC catalysts.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2018.12.033