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Abstract
The mechanism of the hydrogenation of quinone, allyl alcohol and vinyl acetate in acidic aqueous solutions on Pt and Pd-Ag as catalysts has been investigated. The hydrogenation of quinone proceeds predominantly by an electrochemical mechanism involving consecutive anodic and cathodic reactions with zero net current at the metal/solution interface. In contrast, the hydrogenations of allyl alcohol and vinyl acetate proceed predominantly by an non-electrochemical mechanism, ie consecutive reactions between adsorbed hydrogen atoms, adsorbed organic compounds, and intermediates take place in the same way as during the catalytic hydrogenation of a gaseous compound.
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