Abstract
Abstract The catalytic activities of various binary oxides containing vanadium for the liquid-phase oxidation of cyclohexene have been studied, in comparison with those of one component oxides and soluble metal acetylacetonates. The reaction was carried out at 60 °C in benzene solvent. The distribution of reaction products suggests the occurrence of autoxidation and epoxidation when vanadium system catalysts are used. Among the binary catalysts, V–Cr and V–Mo systems showed relatively high specific activities, especially high activity being obtained by the former systems calcined at a low temperature. It seems that cyclohexene oxide is formed mainly by two successive catalytic processes, i.e., the formation of cyclohexenyl hydroperoxide by autoxidation and the selective oxidation of cyclohexene with the hydroperoxide. The machanism of epoxidation was confirmed by the reaction of cyclohexene with t-butyl hydroperoxide in the presence of V–Cr catalyst.
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