Secondary Crystallization of Na_2CO_3-Modified HZSM-5 Zeolites with Tetrapropylammonium Hydroxide and Their Catalytic Performance in Thiophene Alkylation Reaction

查看全文 作　　者：Liu [1,2]Dongmei;Kong [2]Feifei;Zhai [1]Yuchun;Wang [2]Haiyan

机构地区：[1]School of Material and Metallurgy, Northeast University;[2]School of Petrochemical Engineering, Liaoning Shihua University

出　　处：《China Petroleum Processing & Petrochemical Technology》索引2015年第17卷第3期,共8页

基　　金：the financial support by the Natural Science Foundation of Liaoning Province of China (Grant No.201202126);the National Natural Science Foundation of China (Grant Nos. 21276253 and 21401093) 摘　　要：The Na2CO3-modified HZSM-5 zeolites were further treated by tetrapropylammonium hydroxide(TPAOH) solution. The effect of TPAOH concentration on the secondary crystallization process was investigated. The resulting samples were characterized by a complementary combination of X-ray diffraction, N2 adsorption/desorption, scanning electron microscopy, X-ray fluorescence spectroscopy, XPS, 27 Al and 29 Si magic-angle spinning nuclear magnetic resonance spectroscopy, BET and temperature-programmed desorption techniques. The results showed that the secondary crystallization of the HZSM-5 zeolite could result in migration of non-framework species from the internal channels to the zeolite surface and their transformation into framework species. The catalytic activity of these modified samples for thiophene alkylation was evaluated. Both the activity and stability of the catalysts were improved after secondary crystallization. 关键词：HZSM-5分子筛烷基化反应二次结晶碳酸钠催化性能改性噻吩丙基

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Secondary Crystallization of Na_2CO_3-Modified HZSM-5 Zeolites with Tetrapropylammonium Hydroxide and Their Catalytic Performance in Thiophene Alkylation Reaction

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