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.
S. Albonetti, G. Baldi, A. Barzanti, A.L Costa, J. Epoupa Mengou, F. Trifirò, et al. (2007). Chlorinated organics total oxidation over V2O5/TiO2 catalysts prepared by polyol mediated synthesis. APPLIED CATALYSIS A: GENERAL, 325, 309-315 [10.1016/j.apcata.2007.02.031].
Chlorinated organics total oxidation over V2O5/TiO2 catalysts prepared by polyol mediated synthesis
ALBONETTI, STEFANIA;EPOUPA MENGOU, JOSEPH;TRIFIRO', FERRUCCIO;VACCARI, ANGELO
2007
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
