水蒸气处理对P-ZSM-5催化性能的影响  

Effects of Hydrothermal Treatment on Catalytic Performance of P-ZSM-5

作　　者：杨抗震[1] 周钰明[1] 张一卫[1] 刘蓉[1] 

机构地区：[1]东南大学化学化工学院,江苏南京211189

出　　处：《分子催化》2007年第3期220-223,共4页Journal of Molecular Catalysis(China)

基　　金：中国石化安庆分公司(G2502-06-ZS-0290);教育部新世纪优秀人才支持计划(NCET-04-0482)资助项目

摘　　要：在不同温度下,用水蒸气对P-ZSM-5催化剂进行了处理,利用XRD、NH3-TPD、比表面和孔径物理吸附仪等手段对催化剂进行了表征,研究了水蒸气处理对P-ZSM-5催化1-丁烯裂解反应性能的影响.实验结果表明:P-ZSM-5催化剂具有良好的水热稳定性;合适的水蒸气处理,有利于催化剂孔容和孔径的增加;水蒸气处理降低了P-ZSM-5催化剂的酸量和酸强度,明显提高了丁烯裂解生成丙烯的选择性、收率和催化剂的抗积炭性能.最佳的水蒸气处理温度为580℃,P-ZSM-5催化剂催化1-丁烯裂解反应的丙烯选择性为39.4%,收率为34.2%.The ZSM-5 zeolite has an excellent catalytic performance, which modified by P had utilized in CA cracking. The P-ZSM-5 zeolite was modified by hydrothermal treatment at different temperatures, and investigated catalytic performance in butene cracking. Acidity and texture of the zeolites were studied by XRD, NH3-TPD, specific area and pore texture determination. The results show that the crystallinity of P-ZSM-5 zeolites reduces slightly with the increase of treating temperatures. The surface area decreases , while pore volume and diameter increase. P- ZSM-5 zeolite has a good hydrothermal stability. NH3-TPD reveals that amount of acidity and acid strength decrease remarkably after hydrothermal treatment; but it was favorable to enhance the selectivity and yield of propylene, and low the carbon paraffins. During the 4 hours, the P-ZSM-5 zeolites by hydrothermal treatment at 580℃ has an optimum cracking of 1-butene, the propylene selectivity and yield reach to 39.4% and 34.2%.

关 键 词：P-ZSM-5 水蒸气处理 1-丁烯 催化裂化 丙烯 

分 类 号：O643.3[理学—物理化学]