The effect of hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios on its pore structure and catalytic performance

查看全文 作　　者：Yuexin [1]Hou;Xiaoyun [2]Li;Minghui [1,3]Sun;Chaofan [1,4]Li;Syed ul Hasnain [1]Bakhtiar;Kunhao [1]Lei;Shen [1]Yu;Zhao [1]Wang;Zhiyi [1,4]Hu;Lihua [1]Chen;Bao-Lian [1,3,5]Su

机构地区：[1]Laboratory of Living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;[2]State Key Laboratory of Silicate Material for Architectures,Wuhan University of Technology,Wuhan 430070,China;[3]Laboratory of Inorganic Materials Chemistry(CMI),University of Namur,B-5000 Namur,Belgium;[4]Nanostructure Research Centre(NRC),Wuhan University of Technology,Wuhan 430070,China;[5]Clare Hall,University of Cambridge,Cambridge,CB39AL,UK

出　　处：《Frontiers of Chemical Science and Engineering》索引2021年第15卷第2期,共10页

基　　金：This work was also financially supported by the National Natural Science Foundation of China(Grant Nos.21671155,U1663225,21805216,21902122);Major programs of technical innovation in Hubei(No.2018AAA012);Hubei Provincial Natural Science Foundation(No.2018CFA054);Postdoctoral Science Foundation of China(No.2019M652723)。 摘　　要：Hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios(Hier-ZSM-5-x,where x=50,100,150 and 200)were synthesized using an ordered mesoporous carbon-silica composite as hard template.Hier-ZSM-5-x exhibits improved mass transport properties,excellent mechanical and hydrothermal stability,and higher catalytic activity than commercial bulk zeolites in the benzyl alcohol self-etherification reaction.Results show that a decrease in the Si/Al ratio in hierarchical single-crystal ZSM-5 zeolites leads to a significant increase in the acidity and the density of micropores,which increases the final catalytic conversion.The effect of porous hierarchy on the diffusion of active sites and the final catalytic activity was also studied by comparing the catalytic conversion after selectively designed poisoned acid sites.These poisoned Hier-ZSM-5-x shows much higher catalytic conversion than the poisoned commercial ZSM-5 zeolite,which indicates that the numerous intracrystalline mesopores significantly reduce the diffusion path of the reactant,leading to the faster diffusion inside the zeolite to contact with the acid sites in the micropores predominating in ZSM-5 zeolites.This study can be extended to develop a series of hierarchical single-crystal zeolites with expected catalytic performance. 关键词：hierarchical zeolites single crystalline interconnected pores improved diffusion performance benzyl alcohol self-etherification reaction

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The effect of hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios on its pore structure and catalytic performance

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