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Journal of Industrial and Engineering Chemistry, Vol.5, No.3, 161-169, September, 1999
Characterization of V2O5-ZrO2-WO3 and Activity for Propylene Partial Oxidation
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V2O5-ZrO2 modified with WO3 was prepared by adding the Zr(OH)4 powder into a mixed aqueous solution of ammonium metavanadate and ammonium metatungstate followed by drying and calcining at high temperatures. The characterization of the prepared catalysts was performed using FTIR, solid-state 51V NMR, XRD, and DSC. In the case of calcination temperature at 773 K, for the samples containing low loading V2O5 below 18 wt % vanadium oxide was in a highly dispersed state, while for samples containing high loading V2O5 equal to or above 18 wt % vanadium oxide was well crystallized due to the V2O5 loading exceeding the formation of monolayer on the surface of catalyst. The ZrV2O7 compound was formed through the reaction of V2O5 and ZrO2 at 873 K and decomposed into V2O5 and ZrO2 at 1073 K, which were confirmed by FTIR, solid-state 51 NMR, and XRD. V2O5-ZrO2-WO3(15) series catalysts exhibited the effective catalytic activity for propylene partial oxidation and the activity increased with increasing V2O5 content reaching a maximum at 12 wt % V2O5.
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