MoVTeO/SiO_2催化剂上丙烷选择氧化制丙烯醛

Selective Oxidation of Propane to Acrolein over MoVTeO/SiO_2 Catalysts

用浸渍法制备了一系列不同组成的MoVTeO/SiO2催化剂,并用XRD、TPR和催化剂性能评价等方法考察了催化剂的物相结构、氧化还原性质及其对丙烷选择氧化制丙烯醛反应的催化性能.结果表明,由于组份之间的相互作用,MoO3的分散度提高,还原温度降低,且其某些晶面可能部分重构或被其它组份覆盖,因而有利于催化活性的提高和丙烯醛的生成.在考察的不同催化剂组成中,(Mo+V+Te)/Si原子比为6%的MoV0.2Te0.1/SiO2催化剂具有最佳的反应性能.反应条件对催化剂性能的影响说明,在丙烷选择氧化制丙烯醛反应中,丙烯为反应的中间物种.

A series of MoVTeO/SiO_2 catalysts with different compositions were prepared by impregnation method, and the catalyst structure, reducibility and their effects on the catalytic performance in selective oxidation of propane to acrolein were investigated by XRD, TPR and performance evaluation techniques. The results indicated that as a result of the interaction between different components, the dispersion and the reducibility of MoO_3 increased, and the some faces in MoO_3 might be partially reconstructed or covered by the other components, which improved the catalytic activity and selectivity to acrolein. Among the catalysts investigated, the MoV_(0.2)Te_(0.1)/SiO_2 catalyst with 6% loading exhibited the best catalytic performance. The effects of the loading and the reaction conditions on the catalyst performance showed propene being a possible intermediate in conversion of propane to acrolein.