(106b) Influence of Preparation Methods on Catalytic Activity of Bi-Modal Mesoporous Cobalt-Based Catalysts for Fischer-Tropsch Synthesis

A series of bimodal mesoporous cobalt-based catalysts for Fischer-Tropsch synthesis were prepared using three kinds of methods: incipient-wetness impregnation (IWI), excessive impregnation (EI) and vapor-induced internal hydrolysis (VIH). The catalysts were characterized by N₂ physisorption, XRD, HRTEM, H₂-TPR and Raman spectroscopy. The N₂ physisorption results showed the catalysts prepared by IWI and VIH well retained the double mesoporous character, and the cobalt particles were mainly located in the pore proved by HRTEM. The FTS results showed the reducibility and dispersibility of catalysts prepared by IWI and EI were very high. Especially the catalyst prepared by IWI method with smallest Co₃O₄ crystallite size and highest dispersibility showed the higher FTS activity, lower methane selectivity and higher C₅⁺ selectivity.

Key words: bi-modal; preparation method; cobalt-based catalyst; Fischer-Tropsch synthesis