Chlorinated organics total oxidation over V2O5/TiO2 catalysts prepared by polyol-mediated synthesis
Applied Catalysis A: General 325 (2007) 309–315
S. Albonetti a, G. Baldi b, A. Barzanti b, A.L. Costa d, J. Epoupa Mengou a,c, F. Trifiro` a, A. Vaccari a
a Department of Industrial Chemistry and Materials, Viale Risorgimento 4, 40136 Bologna, Italy
b CERICOL, Centro Ricerche Colorobbia, Via Pietramarina 53, 50053 Sovigliana Vinci, Italy
c INCA, Interuniversity Consortium, Dorsoduro 2137, 30123 Venezia, Italy
d CNR-ISTEC, Via Granarolo, 48018 Faenza, Italy
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.
© 2007 Elsevier B.V. All rights reserved.
Available online 3 March 2007 at www.elsevier.com/locate/apcata |
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