V2O5/CeF3catalysts were prepared by wet impregnation method during which, the Cerium Vanadate (CeVO4) formation was observed and confirmed by pore size distribution, powder X-ray diffraction and FT-IR techniques. The CeVO4species is responsible for their high activity and selectivity for the ammoxidation of 3-picoline to nicotinonitrile fx1. V2O5/CeF3catalysts with 2.4-15.2 wt.% of V2O5were prepared by wet impregnation method. The catalysts were characterized by BET surface area and pore size distribution, powder X-ray diffraction and FT-IR. It was found that the formation of Cerium Vanadate (CeVO4) occurs during the stages of the catalyst preparation. The X-ray diffraction studies of the catalysts revealed the presence of crystalline CeVO4phase. The lines due to CeVO4phase were found to increase in intensity with the increase in amount (wt.%) of V2O5in the catalysts. The FT-IR investigation also showed the formation of CeVO4phase with increasing loadings of V2O5. The shift of pore-size distribution to lower pore range and increased pore volume confirmed the formation of CeVO4structure in the catalysts. The catalytic activity for the ammoxidation of 3-picoline to nicotinonitrile on V2O5/CeF3catalysts as a function of V2O5loading on CeF3has been studied. The continuous increase of CeVO4with V2O5loadings is responsible for the higher ammoxidation activity of the V2O5/CeF3catalysts. © 2004 Elsevier B.V. All rights reserved.
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