Synthesis Of Co-Based Catalysts Promoted With Rare Earth Oxides And Their Catalytic Performance For Fischer-Tropsch Synthesis

The synthesis of liquid fuel based on Fischer-Tropsch(F-T) synthesis through the coal or natural gas would have significant meaning in resolving the problems of the national energy-supply security and environment protection in China. To develop one kind of cheap catalyst, which has good character in liquid fuel synthesis and simplify the industrial craft or manipulation, it would cut down the investment and promote the development of liquid fuel synthesis based on F-T synthesis.This paper studied modification effects of different cobalt catalysts supported onγ-Al₂O₃ by XRD, BET, TPR, TEM and tested their catalytic performance for F-T synthesis. The influences of the sulfur content of rare earth oxides and various space velocity and modification effects were discussed.The catalysts promoted with mixed rare earth oxides were prepared and enhanced the dispersion of the cobalt and C₅⁺ selectivity of products. Sulfur in the mixed rare earth oxides poisoned the catalyst. Different space velocity affected the process of chain growth and distribution of products. Neodymium in catalyst impacted on the reduction of cobalt and lowered catalytic activity. Compared mixed rare earth oxides with ruthenium with single rare earth promoter for the performance of F-T synthesis, the mechanism and effect of the different promoters were studied.