Effect of different alkaline earth metals on the adsorption and catalytic behavior of cobalt Fischer–Tropsch synthesis

Alkali earth metals are effective promoters in cobalt-based Fischer–Tropsch synthesis. To compare the similarity and difference of the effect of the same main group of alkali earth metals on Fischer–Tropsch reaction, a series of alkali earth metals-modified alumina was prepared and applied as the supports for Co catalysts. Promotion of Co/Al2O3 catalyst by alkali earth metals achieved a low CH4 selectivity,high C5+ selectivity and C3 o/p due to the lower H*/CO* ratio and enhanced CO dissociation on the surface of catalyst than the unmodified one.