Abstract
Abstract The oxidation of carbon monoxide and magnetic susceptibility measurements have been carried out with a series of nickel oxide-silica-alumina catalysts, all of which are the same in aluminum content but which are different in nickel content. The kinetic data of the oxidation followed an Elovich rate equation, and the initial activity per unit of surface area of the catalyst increased as the nickel content increased from 0 to 8.0 atom%. The apparent activation energy was found to be 8±2 kcal/mol. The magnetic susceptibility vs. temperature curves followed the Curie-Weiss relationship in the temperature range between 240 and 723°K, and the effective Bohr magneton number increased to an approximately constant value of 3.7 Bohr magnetons as the nickel content decreased. The structure of the nickel oxide-silica-alumina catalysts has been discussed on the basis of the results obtained, and the Thomas model of the nickel acid site previously proposed for the active site of the ethylene polymerization (H. Uchida and H. Imai, Bull. Chem. Soc. Japan, 35, 995 (1962)) has been confirmed.
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