Mechanism of photo-oxidation of propene over vanadium oxide supported on silica
- 1 January 1984
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 80 (1) , 119-128
- https://doi.org/10.1039/f19848000119
Abstract
The nature of the active oxygen species and intermediates in the photo-oxidation of propene over vanadium oxide supported on silica has been investigated and a possible mechanism is proposed. The phosphorescence spectra confirm that the active species is the photoexcited VO bond in the catalyst. Aldehydes produced by the oxidation of propene with 18O2 contained little 18O, showing that excited lattice oxygen is the species directly involved in attacking propene. A kinetic study of the photoadsorption of oxygen on a sample of the catalyst having preadsorbed propene showed that the first intermediate comprises one molecule of propene and one molecule of oxygen. The formation of a π-allyl intermediate is suggested from the results of the photo-oxidation of deuterated propene.Keywords
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