Hydrogen peroxide and oxygen-hydrogen oxidation of aromatic compounds in catalytic systems containing heteropoly compounds

摘要

Hydrogen peroxide and Pt activated mixture of gaseous O_2 and H_2 have been applied to oxidation of aromatic compounds in the presence of redox active heteropoly compounds in the form of acid H_4PMo_(11)VO_(40) and tetrabuthylammonium (TBA) salts TBA_4PMo_(11)VO_(40) and TBA_4HPW_(11)Fe(OH)O_(39). Benzene, toluene and phenol were subjected to hydroxylation of the ring, which was accompanied by secondary oxidation in the reaction with hydrogen peroxide. Oxygenation of toluene was equally directed to the ring and to methyl group. The total reactivity of substrates was increased in the order of benzene < toluene < phenol in oxidation by both O_2/H_2 and H_2O_2. Analysis of products yield and composition indicated the identical nature of active intermediates for both oxidants. It was suggested that HPC bonded radical species are responsible for the oxidation of hydrocarbons.