Реферат: Oxidative dehydrogenation of propane (ODP) over a monolayer vanadia-titania catalyst was studied in situ by FTIR, XRD, and XPS. It was found that full reduction of V5+ to V4+ and V3+ occures in propane at 420°C. Simultaneously the atomic ratio [V]/[Ti] significantly decreases indicating the formation of amorphous 3D vanadium oxide clusters. This process is reversible and full oxidation of vanadium to the V5+ state accompanies with restoring the atomic ratio [V]/[Ti] in oxygen even at 350°C. During ODP the partial reduction of V5+ to V4+ was detected without a significant change in the atomic ratio [V]/[Ti]. It means that the adsorption of propane initiates the reduction of V5+ to V3+ that accompanies with weakening the vanadiatitania interaction. According to FTIR, propane adsorbs mainly as isopropoxide which then transforms to propylene. In the presence of oxygen in the gas phase, the fast oxidation of V3+ occurs restoring the structure of the monolayer V2O5/TiO2 catalyst.

Библиографическая ссылка: Kaichev V.V. , Saraev A.A. , Chesalov Y.A. , Bulavchenko O.A.
A Mechanistic Study of Propane Dehydrogenation over V2O5/TiO2 Catalysts
В сборнике 13th European Congress on Catalysis. 2017. – C.193-194.

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