甲醇在水蒸汽处理改性ZSM—5分子筛上转化制丙烯  

Methanol conversion to propylene over steam treated ZSM-5 molecular sieves

作　　者：姚敏[1,2] 张堃[2] 温鹏宇 窦涛[4] 伍永平[1] 

机构地区：[1]西安科技大学,陕西西安710054 [2]神华宁夏煤业集团有限责任公司,宁夏银川750011 [3]上海福瑞得化工科技有限公司,上海201208 [4]中国石油大学(北京),北京102249

出　　处：《工业催化》2011年第12期35-39,共5页Industrial Catalysis

基　　金：国家科技支撑计划(2007BAA08805)资助项目

摘　　要：对硅铝物质的量比分别为20、80和220的ZSM-5分子筛进行水蒸汽处理改性,通过使用X射线衍射、吡啶红外吸附、N_2吸附和透射电子显微镜等手段研究了水蒸汽改性对ZSM-5分子筛孔道结构的影响,并考察了改性后分子筛在甲醇转化制丙烯反应中的催化性能。结果表明,水蒸汽改性处理导致低硅ZSM-5酸性减弱,并使其出现大量介孔。在催化剂用量3 g、470℃、甲醇分压50 kPa和空速1 h^(-1)反应条件下,丙烯在产物中的质量分数为40.89%,丙烯与乙烯质量比为5.9。ZSM-5 catalysts with Si/Al molar ratios of 20,80 and 220 were modified by steam treatment. The as-prepared catalysts were characterized by XRD, Py-IR, N2-adsorption and TEM techniques and their catalytic performance in methanol conversion to propylene was investigated. The results showed that steam treatment for ZSM-5 catalysts with lower Si/A1 ratios led to not only the reduction of the catalyst acidity, but also the formation of the mesopores. The mass fraction of propylene of 40.89% in the prodution and propylene/ethylene mass ratio of 5.9 were attained over the catalyst under the reaction condition of catalyst dosage 3 g,470 ℃,PMeOH =50 kPa,and space velocity 1 h^-1.

关 键 词：催化化学 甲醇 丙烯 ZSM-5分子筛 水蒸汽处理 

分 类 号：O643.36[理学—物理化学] TQ426.94[理学—化学]