文献类型：期刊文献

英文题名：Generating Assembled MFI Nanocrystals with Reduced b-Axis through Structure-Directing Agent Exchange Induced Recrystallization

作者：Zhao, Xiaoling[1];Zeng, Shu[2,4];Zhang, Xueliang[3,5];Deng, Quanzheng[3];Li, Xiujie[2];Yu, Wenguang[2];Zhu, Kake[1];Xu, Shutao[2];Liu, Jichang[1];Han, Lu[3]

机构：[1]East China Univ Sci & Technol, UNILAB, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Natl Engn Lab Methanol Olefins, Dalian 116023, Peoples R China;[3]Tongji Univ, Sch Chem Sci & Engn, Shanghai 200092, Peoples R China;[4]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[5]Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200024, Peoples R China

年份：2021

卷号：60

期号：25

起止页码：13959

外文期刊名：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

收录：;EI(收录号：20212010363094);WOS:【SCI-EXPANDED(收录号:WOS:000651094100001)】；

基金：K.Z., S.X., and L.H. are grateful for the financial support from National Natural Science Foundation of China (21878079, K.Z.; 21972142 and 22022202, S.X.; 21922304 and 21873072, L.H.). S.X. also acknowledge the funding from Liao Ning Revitalization Talents Program (XLYC1807227).

语种：英文

外文关键词：dimethylether-to-olefin; hierarchical architecture; MFI zeolite; recrystallization; reduced b-axis thickness

摘要：Controlling crystal size and shape of zeolitic materials is an effective way to promote their mass transport and catalytic properties. Herein, we report a single step, Na+- and porogen- free crystallization of MFI hierarchical architecture made up of aligned nanocrystals with reduced b-axis thickness (5-23 nm) and adjustable Si/Al ratios between 35 to 120, employing the commonly used tetrapropylammonium hydroxide (TPAOH) and tetrabutylammonium hydroxide (TBAOH) as structure-directing agents (SDAs). Homogeneous nucleation driven by both SDAs and subsequent SDA-exchange induced dissolution-recrystallization are responsible for the formation of such structure. The enhanced textural and diffusion properties account for a notable exaggeration of propene selectivity and catalyst lifetime in dimethyl ether-to-olefins (DTO) conversion. This protocol is extendable to the rational synthesis of other hierarchical zeolites through crystallization process control.