Abstract
Abstract Vanadia/titania samples have been prepared from two different titania supports (P-25 from Degussa and anatase from Tioxide) by impregnation with aqueous solutions of NH4VO3 and calcination at 723 K. A decrease in the specific surface area is observed on increasing the amount of vanadia; titania from Degussa being non-porous, only development of wide pores is observed upon supporting vanadia. However, while the unloaded Tioxide support shows pores with average diameters of 8 and 5 nm, these latter disappear upon incorporation of vanadia. The reactivity of the V2O5/TiO2 sample prepared using the P-25 support in olefin oxidation has been studied by FTIR spectroscopy in the temperature range 150–673 K. Ethylene and propene are adsorbed as such at low temperatures, become hydrated to alkoxy species at medium temperatures and later undergo oxidation to carbonyl compounds (acetaldehyde and acetone). Allylic oxidation of propene and oxidative breaking of the CC bonds is also observed.
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