The role of SiOxCy in the catalytic performance of Co/SiC catalysts for Fischer-Tropsch synthesis. (1st April 2019)

• Record Type: Journal Article
• Authors: Wang, Min; Guo, Shupeng; Li, Zhiwen; Ma, Zhongyi; Wang, Jungang; Hou, Bo; Jia, Litao; Li, Debao
• Is Part Of: Fuel. Volume 241(2019)
• Page Start: 669
• Page End: 675
• Publication Date: 2019-04-01
• Subjects: Fischer-Tropsch synthesis -- SiC -- SiOxCy -- Cobalt -- Catalyst; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2018.12.033
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: The content of SiOx Cy on SiC surface decreased after nitric acid treatment. SiOx Cy had great effect on the electron density and reduction degree of cobalt species. The decrease of SiOx Cy on SiC surface allowed a significant improvement of the C5+ selectivity of Co/SiC catalysts. Abstract: Co/SiC catalysts were prepared to investigate the role of SiOx Cy 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 SiOx Cy 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 SiOx Cy was, the higher the selectivity of long chain hydrocarbon was. It was concluded that the strong electronegativity of SiOx Cy had great effect on the electron density of cobalt species and then on the catalytic performance of the Co/SiC catalysts.