Zn、Ga改性ZSM-5/SAPO-34复合分子筛的制备及其甲醇芳构化应用  

Synthesis and methanol aromatization performance of Ga and Zn modified ZSM-5/SAPO-34 composite molecular sieves

作　　者：蒋忠祥[1] 王海彦[1] 张玲[1] 魏民[1] 

机构地区：[1]辽宁石油化工大学化学化工与环境学部,辽宁抚顺113001

出　　处：《天然气化工—C1化学与化工》2016年第5期10-14,共5页Natural Gas Chemical Industry

基　　金：辽宁省自然科学基金;Ga修饰多级孔ZSM-5分子筛催化乙醇芳构化性能研究(201202126)

摘　　要：采用外延生长法合成了ZSM-5/SAPO-34复合分子筛,并通过浸渍法用金属离子Zn和Ga对其进行了改性。利用X射线衍射(XRD)、扫描电镜(SEM)、吡啶-原位傅里叶红外变换光谱(Py-IR)、氨气程序升温脱附(NH_3-TPD)、氮气吸附脱附(BET)等手段对制备的分子筛样品进行了表征,并对催化剂进行了甲醇芳构化催化性能评价。结果表明,在复合分子筛的基础上,加入金属使分子筛的比表面积和孔容减小,且双金属改性可有效调整分子筛表面L/B酸比例,明显提高了分子筛在甲醇芳构化中的催化活性和选择性。Zn and Ga modified ZSM-5/SAPO-34 composite molecular sieves were prepared by the method of two-step crystallization, and characterized by XRD, SEM, PY-IR, NH3-TPD and BET. Their catalytic performances in the aromatization of methanol were evaluated. The results show that modifying the ZSM-5/SAPO-34 molecular sieves by Ga and Zn could not only reduce the surface area and pore volume of the molecular sieves, but also effectively regulate and control the L/B acid ratio on the surface of molecular sieves and obviously increase catalytic activity in the aromatization of methanol.

关 键 词：镓、锌改性 ZSM-5/SAPO-34复合分子筛 外延生长法 甲醇芳构化 

分 类 号：TQ426.94[化学工程] TQ241