对比研究了VPO和VPO/SiO2 催化剂的结构、表面元素氧化态、还原性及其对丙烷选择氧化反应的催化性能 .与VPO催化剂相比 ,VPO/SiO2 催化剂具有较大的比表面积 ;VPO主要以 (VO) 2 P2 O7的形式高度分散于SiO2 表面 ;VPO/SiO2 催化剂的还原温度较低 ;VPO/SiO2 催化剂与丙烷的相互作用较强 ;在反应条件下 ,VPO/SiO2 催化剂的活性较高 ,但产物丙烯的选择性较低 ,并有丙烯醛等C3含氧化合物生成 .这可能是由于VPO/SiO2 催化剂表面的V与Si发生了相互作用之故 .随着VPO担载量的增加 ,VPO/SiO2 催化剂的比表面积减小 ;催化剂的还原温度略有升高 ,可还原的晶格氧量增加 ;催化剂表面与丙烷的相互作用增强 ;丙烷转化率升高而丙烯选择性降低 ,丙烯醛选择性在 5 %VPO/SiO2 催化剂上最高 .这可能是由于随着VPO担载量的增加 ,催化剂表面晶格氧的密度增大所致 The VPO and VPO / SiO2 catalysts were characterized by X-ray diffraction (XRD), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy.The structures, surface oxidation states and reductivities of VPO and VPO / SiO2 catalysts and their catalytic performance for selective oxidation of propane were investigated. (VO) 2 P2 O7 is highly dispersed on the surface of SiO2; the reduction temperature of VPO / SiO2 is lower; the interaction between VPO / SiO2 and propane is stronger; the activity of VPO / SiO2 is higher under the reaction conditions, However, the selectivity of propene was lower and there were C3 oxygenates such as acrolein, probably due to the interaction between V and Si on the surface of VPO / SiO2 catalyst.With the increase of VPO loading, VPO / SiO2 catalyst decreased, the reduction temperature of catalyst slightly increased, the amount of reducible lattice oxygen increased, the interaction between catalyst surface and propane enhanced, the conversion of propane increased but the selectivity of propylene decreased, the selectivity of acrolein The highest was 5% VPO / SiO2 catalyst, probably due to the increased density of lattice oxygen on the catalyst surface with increasing VPO loading