Abstract
Europium catalysis for reductive activation of O2 and monooxygenation of hydrocarbons are discussed in this review. Two Eu-systems, the Eu(III)-O2-Zn system and the Eu(III)-Ti(IV)-Pt-O2-H2 system, are described. A whole scheme of the Eu-system is proposed from various kinetic studies for the oxidation of cyclohexane, the epoxidation of 1-hexene, and the hydroxylation of benzene. The reactivities of the active oxygen species for various hydrocarbons (methane, ethane, propane, hexane, adamantane, cy-C5H10+cy-C6H12, cy-C6D12+cy-C6H12, cis- and trans-1,2-dimethylcyclohexane, propylene, cis- and trans-2-hexene, benzene, toluene) are summarized and compared with well-known oxidation systems. Oxidation state of Eu species was studied by cyclic voltammogram and UV-visible absorption techniques. On the basis of experimental results, the models of reaction mechanism is proposed.
Published Version
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