Infrared study of the selective oxidation of toluene and o-xylene on vanadium oxide/TiO2

A.J. van Hengstum, J. Pranger, S.M. Hengstum-Nijhuis, J.G. van Ommen, P.J. Gellings

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Infrared spectroscopy was used to obtain information on the mechanism of the selective oxidation of toluene and o-xylene over vanadium oxide catalysts. The interaction of these aromatic hydrocarbons and the products benzaldehyde and o-tolualdehyde with the surface of a V2O5/TiO2 monolayer catalyst was investigated at different temperatures under conditions comparable to those of the catalytic reaction. The infrared results obtained for each of these compounds showed a great resemblance, indicating that their oxidation proceeds along the same reaction path. Coordinatively adsorbed aldehydes, carboxylate-like structures, and benzoate species could be identified as intermediates on the surface of the catalysts. On the basis of the spectroscopic observations a possible reaction mechanism has been proposed.
Original languageUndefined
Pages (from-to)323-330
JournalJournal of catalysis
Issue number2
Publication statusPublished - 1986


  • IR-69717

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