HYDROGENATION OF CARBON-MONOXIDE OVER COBALT NICKEL-ALLOY CATALYST SUPPORTED ON MNO-ZRO2 MIXED-OXIDE

Hydrogenation of carbon monoxide was studied over mixed oxide supported 50Co50Ni alloy catalysts. The activity as well as the selectivity for carbon monoxide hydrogenation is strongly affected by the oxide support. The mixed oxides containing ZrO2, CeO2, and Nb2O5 promoted the carbon monoxide hydrogenation over 50Co50Ni, but those containing MgO or ZnO lowered the overall activity of Co-Ni alloy. The product distribution on the alloy catalyst supported on ZrO2-Nb2O5, Nb2O5-V2O5, MnO-ZrO2 and MnO-V2O5 deviated from the Schulz-Flory distribution owing to the high yield of gasoline. In particular, the formation rate of gasoline on Co-Ni/MnO-ZrO2 amounts to 9.87·10-3 mol h-1 g-1 at 548 K. Mixing MnO with ZrO2 forms electronic unsaturated sites and the mixed oxide support interacts electronically with the Co-Ni alloy through these electronic unsaturated sites. The electronic density of Co-Ni alloy depends on the kind of mixed oxide and its composition. A support effect was recognized in the adsorption state of hydrogen and carbon monoxide. © 1990.