CO_2氧化丙烷脱氢制丙烯Pd-Cu/MoO_3-SiO_2催化剂研究

Study of Propane Oxiditive Dehydrogenation to Propene with Carbon Dioxide on Pd-Cu/MoO_3-SiO_2 Catalyst

以MoO3 SiO2复合物作载体,采用等体积浸渍法制得了Pd Cu催化剂,采用BET、TPR、IR对催化剂结构及CO2、C3H8在催化剂上的吸附位、吸附态进行了分析。实验结果证明,CO2在催化剂上存在卧式吸附态,丙烷以亚甲基和其中一个甲基上的氢吸附在Mo=O双键的端基氧上。在微型反应装置上测试了催化剂在CO2氧化丙烷脱氢制丙烯反应中的催化性能,常压和600℃条件下,C3H8转化率达26 94%,C3H6选择性达78 34%。通过催化剂的物化性质、化学吸附性质与反应性能的关联,讨论了反应机理和影响催化剂性能的基本因素。

MoO3SiO2 (MoSiO) surface complex supports were prepared by surface modification PdCu bimetallic catalysts were prepared by incipient impregnation BET, TPR and IR techniques have been used to investigate the structure of catalysts and chemisorption states of CO2 and C3H8 Horizontal type chemisorption of CO2 is found; C3H8 is chemisorbed on terminal O of Mo=O bond through H of methylene and one of methyl The catalysts were tested in the reaction of oxidative dehydrogenation of propane with carbon dioxide to propene in a microreactor In the condition of ambient pressure and 600℃, the conversion of propane was 2694%, and the selectivity of propene was 7834% By relating the physical and chemical characters of catalysts with their performance in reaction, a reaction mechanism was proposed and the factors which influence the activity of the catalysts were also studied