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Barium modified Co/Al2O3 catalysts were prepared by incipient wetness impregnation.The catalysts were characterized by XRD,TPD and DRIFTS.The catalytic activity for Fischer-Tropsch synthesis was measured in a continuously stirred tank reactor.It was found that small amounts of BaO(≤2 wt%) improved the cobalt reducibility,which led to more cobalt active sites on the catalyst surface,and then resulted in higher CO conversion and C5+ selectivity.However,for the catalysts with high BaO loadings negative effects on the catalytic activity and selectivity for high hydrocarbons were observed because of low cobalt reducibility.
Barium modified Co / Al2O3 catalysts were prepared by incipient wetness impregnation. The catalysts were characterized by XRD, TPD and DRIFTS. The catalytic activity for Fischer-Tropsch synthesis was measured in a continuously stirred tank reactor. It was found that small amounts of BaO ( ≤2 wt%) improved the cobalt reducibility, which led to more cobalt active sites on the catalyst surface, and then resulted in higher CO conversion and C5 + selectivity. However, for the catalysts with high BaO loadings negative effects on the catalytic activity and selectivity for high hydrocarbons were observed because of low cobalt reducibility.