摘要
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。
MoO3SiO2 (MoSiO) surface complex supports were prepared by surface modification PdCu 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 CO2 and C3H8 Horizontal type chemisorption of CO2 is found; C3H8 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 microreactor In the condition of ambient pressure and 600℃, the conversion of propane was 2694%, and the selectivity of propene was 7834% 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
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2003年第5期1-5,9,共6页
Natural Gas Chemical Industry
基金
国家自然科学基金资助项目 (2 0 0 760 3 5)