CO2氧化丙烷脱氢MoO3-V2O5/SiO2催化剂研究

采用表面改性和等体积浸渍法制备了MoO3-V2O5／SiO2复合氧化物，采用TPR、IR、TPD和微反技术表征了催化剂对CO2和C3H8的吸附性能和CO2部分氧化丙烷脱氢的反应性能．结果表明：随MoO3加入量的增加，V=O还原温度降低，晶格氧更易活化．CO2和丙烷的活化温度降低，丙烷转化率增高，丙烯选择性下降．V=O中晶格氧的活化是CO2氧化丙烷制丙烯反应的关键．

MoO3-V2O5/SiO2 Catalyst for Oxidative Dehydrogenation of Propane with CO2

MoO_3-V_2O_5/SiO_2 surface compound oxides were prepared by the methods of surface reaction modification and isovolumn impregnation. Chemisorption properties and partial oxidation behavior of C_3H_8 with CO_2 on the MoO_3-V_2O_5/SiO_2 catalyst were characterized by TPR, IR, TPD and micro-reactor techniques. The results show that the reduction temperature of V=O species is decreased and more activity lattice oxygen is easier to be activated due to the addition of MoO_3.Unidentate, bidentate and bridged carbonate are formed when carbon dioxide is chemisorbed on the catalyst surface, CO and lattice oxygen are formed during desorption of the bidentate and bridged carbonates. Propylene and water are formed during desorption of propane chemisorbed on the lattice oxygen in the V=O species through H of methyl and methylene binary site. Conversion of propane is increased and selectivity of propylene is decreased with the addition of MoO_3.Activation of lattice oxygen in the V=O species is of importance in the reaction of CO_2 oxydehydrogenation of propane to propylene.