Mécanisme De La Catalyse Dans L'Oxydation Du Propylène En Phase Liquide

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Abstract
Several peroxo derivatives of azo chelates of MoO2++ were used as catalysts for the liquid phase oxidation of propylene in benzene (propylene/benzene = 0.63 g/g) at 150°C., under a total pressure of 45 atm and limited to a conversion of 7.5%. High selectivities in epoxypropane are obtained, but are generally similar to that issued from the oxidations catalysed by the corresponding nonperoxo chelates. This suggests a cyclic catalytic mechanism in which, in a first step, the MoO2++ cation is peroxidised by the peroxidic radicals and, in a second step, the olefin is epoxidised by the peroxo chelate. The results obtained in the vapor and liquid phase epoxidations of olefins suggest that in the liquid phase, the high density in peroxidic radicals gives immediately to the catalyst a high efficiency toward epoxidation.

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