Solid-state 51V NMR and infrared spectroscopic study of vanadium oxide supported on TiO2-ZrO2

Vanadium oxide catalyst supported on TiO2-ZrO2 has been prepared by adding Ti(OH)(4)-Zr(OH)(4) powder to an aqueous solution of ammonium metavanadate followed by drying and calcining at high temperatures. The characterization of the prepared catalysts was performed using solid-state V-51 NMR and FTIR. In the case of calcination temperature at 773 K, vanadium oxide was in a highly dispersed state for the samples containing low loading V2O5 below 25 wt %, but for samples containing high loading V2O5 equal to or above 25 wt %, vanadium oxide was well crystallized due to the V2O5 loading exceeding the formation of monolayer on the surface of TiO2-ZrO2. The ZrV2O7 compound was formed through the reaction of V2O5 and ZrO2 at 773-973 K, whereas the V3Ti6O17 compound was formed through the reaction of V2O5 and TiO2 at 973-1073 K. The V3Ti6O17 compound decomposed to V2O5 and TiO2 at 1173 K, which were confirmed by FTIR and V-51 NMR.