Hydrogenation of carbon monoxide over SiO 2-supported Fe-Co, Co-Ni and Ni-Fe bimetallic catalysts

Abstract

Hydrogenation of carbon monoxide was studied at 523 K under 1.0 MPa over SiO 2-supported bimetallic catalysts. The activities of SiO 2-supported bimetallic catalysts of Fe-Co, Co-Ni and Ni-Fe for CO hydrogenation were greater than those of monometal catalysts. The product distribution was shifted to the higher hydrocarbons by alloying of metals. The SiO 2-supported bimetallic catalysts were slightly less active than TiO 2-supported ones; the product distribution was not affected by the support. Olefins, paraffins and gasoline compounds were produced selectively on Fe-Co, Ni-Fe and Co-Ni bimetallic catalysts, respectively. The cobalt-nickel system is particularly suitable for catalytic gasoline synthesis because this catalyst is most selective for formation of higher hydrocarbons as well as most active for CO conversion. It is clear that alloying affects the adsorption ability of hydrogen and carbon monoxide, resulting in a change in the ratio of activated hydrogen and carbon monoxide on the surface.