Al_(2)O_(3)基底上Zn/HZSM-5分子筛膜的制备与甲醇芳构化性能  

Preparation and Methanol Aromatization Properties of Zn/HZSM-5 Molecular Sieve Membrane on Al_(2)O_(3) Substrate

作　　者：盖媛媛[1] 席琳 GE Yuan-yuan;XI Lin(Department of Chemical Engineering,Yulin Vocational and Technical College,Yulin Shaanxi 719000,China;Engineering Research Center of Ministry of Education for Fine Chemicals,Shanxi University,Taiyuan Shanxi 030006,China)

机构地区：[1]榆林职业技术学院化学工程系,陕西榆林719000 [2]山西大学精细化学品工程研究中心,山西太原030006

出　　处：《当代化工》2022年第11期2632-2637,共6页Contemporary Chemical Industry

基　　金：榆林市科技计划项目(项目编号:CXY-2020-017-04);榆林高新区科技计划项目(项目编号:cxy-2020-42)。

摘　　要：通过在Al_(2)O_(3)微球上原位生长HZSM-5分子筛膜并负载Zn后获得了宏观颗粒尺寸2~3mm的Zn/HZSM-5/Al_(2)O_(3)分子筛,研究了其甲醇芳构化性能。结果表明:HZSM-5均匀包覆在Al_(2)O_(3)表层,并呈现出B酸为主的表面酸性质,该催化剂实现了98%以上的甲醇转化率以及35.25%的芳烃选择性。引入Zn后,在保持98%以上甲醇转化率的同时,芳烃选择性达到42.60%。Zn/HZSM-5/Al_(2)O_(3)中ZnOH~+物种提供的L酸性中心,与分子筛的B酸中心协同作用,使催化剂的芳构化性能得到了显著提高。Zn/HZSM-5/Al_(2)O_(3)molecular sieves with macro particle size of 2~3 mm was obtained by in-situ growth of HZSM-5 molecular sieve membrane on Al_(2)O_(3)microspheres and loading Zn. The methanol aromatization properties of Zn/HZSM-5/Al_(2)O_(3)molecular sieves were studied. The results showed that HZSM-5 was uniformly coated on the surface of Al_(2)O_(3)and showed surface acid properties dominated by B acid. The catalyst achieved methanol conversion of more than 98% and aromatics selectivity of 35.25%. After the introduction of Zn, the aromatics selectivity reached 42.60% while maintaining the methanol conversion of more than 98%. In Zn/HZSM-5/Al_(2)O_(3)the aromatization performance of the catalyst was significantly improved by the synergistic effect of L acid center provided by ZnOH+species and B acid center.

关 键 词：HZSM-5分子筛膜 Al_(2)O_(3)基底 Zn改性 甲醇芳构化 催化性能 

分 类 号：O643.3[理学—物理化学]