Substituent Effects in Heterogeneous Catalysis. VII. Temperature Independence of the Relative Rates in Metal-catalyzed Hydrogenation of Cyclohexanone and Its 2-Alkyl Derivatives

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Abstract The rates of hydrogenation of cyclohexanone and its 2-alkyl derivatives have been measured using decalin as the solvent in a temperature range of −5 to 68 °C over Ru/Al2O3, Rh/Al2O3, and Pt/Al2O3 catalysts. As predicted previously, 2-methyl-, 2-ethyl-, and 2-propylcyclohexanone have exhibited nearly identical temperature dependencies in adsorption and hydrogenation, while cyclohexanone and 2-isopropylcyclohexanone had quite different dependencies.