XAS Study on Calcination Effect of Silica Supported Cobalt Catalysts for Fischer-Tropsch Synthesis

Abstract:

The precalcined and calcined silica supported cobalt catalysts at 15, 20, and 25%Co were investigated by X-ray Absorption Spectroscopy (XAS) including the X-ray absorption near edge structure (XANES) and the extended X-ray absorption fine structure (EXAFS). The results showed the phase of Co(NO₃)₂.6H₂O in all precalcined catalysts, which corresponded to the XRD measurement. When increasing the amount of cobalt in the precalcined catalysts, there was the presence of ordered Co(NO₃)₂.6H₂O phase. After calcination in Ar at 600°C for 6 h, the Co₃O₄ phase was presented in all calcined catalysts. For the catalytic performance testing, the selected 20%Co/Aerosil_wi_calcined catalyst was reduced at 450°C in H₂ and operated at 190°C with a total pressure of 10 bar and H₂/CO flow rate of 20:10 ml/min for Fischer-Tropsch synthesis. After reaction testing, the used 20%Co/Aerosil_wi catalyst showed the main phase of Co₃O₄. The result showed high methane selectivity at the beginning of reaction. By increasing of reaction time, the methane selectivity tended to decrease, whereas the C₂-C₄ and C₅₊ selectivity was increased.

• Periodical: Advanced Materials Research (Volumes 608-609)
• Pages: 1413-1418
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.608-609.1413
• Online since: December 2012
• Authors: Siwaruk Chotiwan, Waritsara Bungmek, Sanya Prangsri-Aroon, Pinsuda Viravathana
• Keywords: Calcination, Cobalt Catalyst, Fischer-Tropsch Synthesis (FTS), XAS

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