Parameters influencing the synergetic effect induced by vanadium incorporation on non-conventional (Al)(Ga)PO supports for the propane ammoxidation

Abstract

A series of V-oxide supported catalysts (5V/AlPO 4, 5V/Al 0.5Ga 0.5PO 4, 5V/GaPO 4) were prepared in order to study their catalytic behaviour in the ammoxidation of propane. Catalysts were characterized by BET surface area, XRD, Raman spectroscopy, TPR-H 2 and XPS. The presence of vanadium induced the crystallization of the supports (AlPO 4, Al 0.5Ga 0.5PO 4 and GaPO 4). Crystalline V 2O 5 was observed on the V-based catalysts. Catalytic results showed that the impregnation of vanadium enhances the propane conversion and selectivity to acrylonitrile (ACN). At 530 °C 5V/Al 0.5Ga 0.5PO 4 exhibits the highest selectivity to ACN. One assumes that the best performance of 5V/Al 0.5Ga 0.5PO 4 in propane ammoxidation, is due to on the one hand the easiest reduction of V 2O 5 on Al 0.5Ga 0.5PO 4 and to on the other hand a certain tunability of the reduced species stabilized on Al 0.5Ga 0.5PO 4.