文献类型：期刊文献

英文题名：Steamed Zn/ZSM-5 catalysts for improved methanol aromatization with high stability

作者：Wei, Zhenhao[1];Chen, Lifang[2];Cao, Qingsheng[1];Wen, Zhenhao[1];Zhou, Zhuo[1];Xu, Yarong[3];Zhu, Xuedong[1,2]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, UNILAB, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]PetroChina Co Ltd, Urumchi Petrochem Co, Res Inst, Urumqi 830019, Peoples R China

年份：2017

卷号：162

起止页码：66

外文期刊名：FUEL PROCESSING TECHNOLOGY

收录：;EI(收录号：20171403526479);WOS:【SCI-EXPANDED(收录号:WOS:000401212500008)】；

基金：We gratefully acknowledge funding from the Doctoral Fund of Ministry of Education (20130074110018) and the National Natural Science Foundation of China (21446003).

语种：英文

外文关键词：Zinc species; ZSM-5; Steam treatment; Methanol to aromatics

摘要：The effects of steam treatment on Zn species modified ZSM-5 (Zn/ZSM-5) were systematically studied by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Al-27 MAS NMR spectroscopy, inductively coupled plasma-optical emission spectroscopy, N-2 physisorption, NH3 temperature-programmed desorption, infrared spectroscopy of adsorbed pyridine, Raman spectroscopy and thermogravimetric analysis. It was found that Zn species could efficiently enhance the hydrothermal stability of ZSM-5. Moreover, the ZnO species was enriched on the surface of ZSM-5 after steam treatment, while ZnOH+ species almost kept constant. The catalytic performance of steamed and non-steamed catalysts was evaluated in the process of methanol to aromatics (MTA). Zn/ZSM-5 steamed at 400 degrees C exhibited higher selectivity for aromatics than non-steamed Zn/ZSM-5. The enhanced selectivity for aromatics was ascribed to the high retention ratio of Bronsted acid sites and newly created mesopores of Zn/ZSM-5 steamed at 400 degrees C. In addition, the steamed catalysts showed lower deactivation rate and more coke on external surface compared to non-steamed catalysts, which could be the reason for superior catalyst stability. (C) 2017 Elsevier B.V. All rights reserved.