Formation of CeVO4phase during the preparation of CuVCe oxide catalysts
Abstract
The presence of copper and vanadium in ceria at different concentrations gives solids with different characteristics which vary with calcination temperature. At low copper and vanadium concentrations, only the CeO2 phase is formed. When the concentration of copper is relatively high compared to vanadium, a CuO phase appears alongside CeO2. However, when the concentration of vanadium is relatively high compared to copper, CeVO4 and V2O5 phases are formed along with CeO2. The formation of the CeVO4 phase is due to the reaction between a trapped electron and V2O5−x/CeO2−y leading to reduction of CeIV to CeIII.