Study on VTeO/SiO_2 Catalysts for Selective Oxidation of Propane to Acrolein

In the paper,a relatively simple SiO_2-supported VTeO catalyst system has been prepared and studied for selective oxidation of propane to acrolein.The effects of composition,catalyst preparation and reaction conditions on the catalytic performance were investigated.The main results of the study have indicated that by adding proper quantity of Te into 3V/SiO_2 catalyst,the selectivity and the yield of acrolein were notably increased.The V5+ sites were mainly responsible for the activation of propane to produce propane,whereas the Te4+ sites were beneficial to the transformation of propane to acrolein.The catalyst 3V0.5Te/SiO_2 which was prepared in the impregnation solution at the pH amounting to 7 and the elements V,Te were co-impregnated.The maximal yield of acrolein of 6.6% was obtained on 3V0.5Te/SiO_2 catalyst under the optimal reaction conditions(520 ℃,C_3H_8:O_2:He = 1.2:1:1.2,3900 mL?g-1?h-1).