CHARACTERIZATION BY SOLID-STATE V-51 NMR AND X-RAY-DIFFRACTION OF VANADIUM-OXIDE SUPPORTED ON ZRO2

Vanadium oxide-zirconia catalysts were prepared by dry impregnation of powdered Zr(OH)(4) with aqueous solution of NH4VO3. The characterizat ion of prepared catalysts was performed using V-51 solid State NMR, XR D, and DSC. The addition of vanadium oxide up to 9 mol% to zirconia sh ifted the phase transitions of ZrO2 from amorphous to tetragonal towar d higher temperatures due to the interaction between vanadium oxide an d zirconia. On the basis of results of XRD and DSC, it is concluded th at the content of V2O5 monolayer covering most of the available zircon ia was 9 mol%. The crystalline V2O5 was observed only with the samples containing V2O5 content exceeding the formation of complete monolayer (9 mol%) on the surface of ZrO2.