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We have measured the reduction kinetics, adsorption behavior, and catalytic activity of a series of Cu/ZnO, Cu/Co/ZnO, and Cu/Co/ZnO/Al203 catalysts. Reduction occurs in two stages, assigned to the sequential reduction of Cu and Co cations in a mixed oxide precursor. The IR and TPD results for CO and H2 show that the reduced catalyst contains metallic Cu clusters, which consist primarily of high Miller index surface planes. Cobalt is present on the surface of these clusters in the form of low coordination number sites that are capable of adsorbing multiple CO molecules. The resulting catalysts are much less active for CH3OH synthesis than the corresponding binary Cu/ZnO catalysts but are capable of forming C2H5OH and CH4 with a selectivity different from that of conventional supported Co catalysts.

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