Kinetic Relationships of Liquid-Phase Oxidation of Styrene with Hydrogen Peroxide in the Presence of Polyoxotungstate Modified with Cerium Cations

摘要

Liquid-phase oxidation of styrene with hydrogen peroxide in the presence of a catalytic system based on (NH4)(10)W12O41+ Ce(NO3)(3)+ H3PO4, supported on a microstructured carbon material and treated with an aqueous H(2)O(2)solution, was studied. The major reaction products are phenyloxirane and benzaldehyde, with phenylacetaldehyde, 1-phenylethane-1,2-diol, and benzoic acid also present. The kinetic relationships of the process were studied, and a kinetic model according to which phenyloxirane is the primary reaction product was suggested. Aldehydes are accumulated by parallel routes: oxidation of phenyloxirane and of its hydrolysis product, 1-phenylethane-1,2-diol. With an increase in the styrene: H(2)O(2)molar ratio, oxidation of 1-phenylethane-1,2-diol becomes the major pathway of the aldehyde formation.