文献类型：期刊文献

英文题名：Coating mesoporous ZSM-5 by microporous silicalite-1 shell: Preparation and enhanced catalytic properties in methane co-aromatization with propane

作者：Xu, Guohao[1];Zhang, Peng[1];Cheng, Junjun[1];Xu, Lei[2];Fan, Jinlong[2];Zhu, Xuedong[1];Yang, Fan[1]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, Minist Educ, Shanghai 200237, Peoples R China;[2]PetroChina Res Inst Urumqi Petrochem Co, Urumqi 830019, Peoples R China

年份：2022

卷号：330

外文期刊名：MICROPOROUS AND MESOPOROUS MATERIALS

收录：;EI(收录号：20214911276616);WOS:【SCI-EXPANDED(收录号:WOS:000727706700005)】；

基金：This project was sponsored financially by the National Natural Sci-ence Foundation of China (No. 21776076).

语种：英文

外文关键词：Core-shell structure; Carbon deposits; Silicalite-1 shell

摘要：A novel core-shell structured catalyst (Zn/MZSM-5@S-1) with the microporous silicalite-1 shell and the mesoporous ZSM-5 core (Zn/MZSM-5) was prepared by the epitaxial recrystallization method using tetrapropylammonium hydroxide (TPAOH) as template. Multitechniques including XRD, TEM, N2 adsorption-desorption, XPS, 27Al NMR, IR, NH3-TPD, IG and ICP were employed to investigate the physicochemical properties of the core-shell Zn-MZSM-5@S-1 and the deactivation of carbon deposits. Results revealed that the diffusion capacities of Zn-MZSM-5@S-1 have been dramatically improved after the epitaxial growth of the silicalite-1 shell. In addition, the non-acidic silicalite-1 shell covering on Zn/MZSM-5 core could decrease the external Bronsted acid sites, and thus inhibit the formation of carbon deposits. Applying the protective shell increased the stability of the core-shell catalyst in comparison to Zn/MZSM-5 catalyst without the silicalite-1 shell. However, the overgrowth of the silicalite-1 shell extended the diffusion path of reactants and products, reducing the catalytic properties in methane co-aromatization with propane. In this sense, the controlled formation of desired thickness of the silicalite-1 shell around Zn/MZSM-5 core accounted for the enhanced catalytic properties.