Abstract
Abstract Vanadia and titania/vanadia sols synthesized by the polyol method were used to prepare TiO2-supported catalysts. Both the modification of the V2O5 sol with a low amount of water and the use of a TiO2/V2O5 sol induced a reliable adhesion between the preformed active phases and the support, thus leading to stable catalysts. Despite the low amount of vanadium introduced in studied samples, V2O5/TiO2/WO3 catalysts were active in the o-DCB oxidation. The best results were obtained with 0.36-V2O5–TiO2 catalyst, prepared by direct impregnation with colloidal TiO2/V2O5-mixed oxides. The electroacoustic analysis indicated that the support does not show any particular electrostatic affinity for any studied sol; therefore, the higher ability of TiO2/V2O5 sol to form stable vanadium active species may possibly be explained by a better chemical affinity with the support.
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