FT-IR Study of Adsorption and Oxidation of Toluene on Vanadium Oxide layered on ZrO_2

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The adsorption and oxdation of toluene on mono- and multi-layer V-Zr oxides prepared by the gas-phase method and the surface structure of the catalysts under reaction conditions have been studied by Fourier-transform infrared spectroscopy as well as the microcatalytic method. From the adsorption of toluene on the V-Zr oxides, it is found that Lewis-acidic sites (vanadium ion) play an important role to form a π-complex of toluene. The methyl group of the π-complex is dehydrogenated by the V=O species to form benzyl species and benzaldehyde. The activity of V=O species on the monolayer catalyst is about three times higher than that on the multi-layer catalyst.

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