Promotion effect of ceria on Fischer-Tropsch synthesis performance over Co/Al2O3 catalyst

The effects of ceria-loading and calcination temperature on catalytic performance of Co/Al2O3 in Fischer-Tropsch synthesis were studied, and the catalyst samples were characterized by means of temperature-programmed reduction (TPR), temperature-programmed oxidation (TPO) and XRD techniques. The results showed that the addition of small amount of ceria to Co/Al2O3 catalyst (n(Ce)/n(Co) = 0.1 similar to0.14) can increase the CO conversion and C5+ hydrocarbons selectivity, while the calcination temperature can control both the chain growth probability and CO conversion with reverse trend. The TPR and TPO experiments showed that the addition of small amount of ceria can improve the reducibility of the catalyst, but the amount of cabon-deposition increases, and there are two carbon-deposition species on the catalyst after reaction for 10 h.