ZSM-5/磷酸铝复合分子筛在甲醇制烯烃反应中的应用  

Application of ZSM-5/Aluminophosphates Composite Zeolite for Methanol to Olefins

作　　者：王政[1,2] 王林[1] 张国香[1] 马清祥[1] 赵天生[1] 

机构地区：[1]宁夏大学能源化工自治区重点实验室省部共建天然气转化国家重点实验室培育基地,宁夏银川750021 [2]宁夏大学化学化工学院,宁夏银川750021

出　　处：《石油学报（石油加工）》2011年第4期543-548,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(21066011);宁夏科技公关国际合作研究专项(08GJ-201);宁夏自然科学基金(NXZR2009-4);国家科技支撑计划子课题(2007BAA08B0502)资助

摘　　要：水热体系中将ZSM-5添加到磷酸铝分子筛的合成液中,制得了ZSM-5/磷酸铝复合分子筛催化剂,采用XRD、SEM、FT-IR和NH_3-TPD方法表征其物化性能,同时考察了该复合分子筛对甲醇制烯烃反应的催化活性。结果表明,制备的分子筛为ZSM-5/磷酸铝复合分子筛,磷酸铝分子筛中含有AlPO_4-5与AlPO_4-18 2种晶相;与纯ZSM-5分子筛相比,复合分子筛的酸性明显减弱且酸量减少。与ZSM-5和ZSM-5+磷酸铝分子筛机械混合样品相比,ZSM-5/磷酸铝复合分子筛表现出了良好的协同作用和优良的催化性能,在甲醇转化率为100%情况下,总低碳烯烃、乙烯和丙烯选择性分别为83.5%、36.5%和36.0%,产物中C_2～C_4烷烃以及C_(5+)选择性较低。ZSM 5/Aluminophosphates composite zeolite was hydrothermally synthesized by adding ZSM-5 powder into the synthesis solution of aluminophosphates, and was characterized by XRD, SEM, FT-IR, BET, NH3 TPD and so on. The catalytic activity of composite zeolite was evaluated for methanol to olefins reaction. It was confirmed that composite zeolite had typical ZSM-5 and aluminophosphates structure. Both A1PO4-5 and A1PO4-18 phases were found in aluminophosphates. Compared with the ZSM-5, the acid strength and acid amount of composite zeolite were significantly decreased. The selectivities of light olefins （83.5~）, ethylene （36.5%） propylene （36%） were higher and the selectivities of C2 C4 alkyl and C5_ were much lower in methanol to olefins reaction over the composite zeolite than that over pure ZSM-5, the mechanical mixture of ZSM 5 and aluminophosphates.

关 键 词：MTO 复合分子筛 ZSM-5 磷酸铝分子筛 

分 类 号：O643[理学—物理化学]