四丙基氢氧化铵改性纳米HZSM-5分子筛及其在甲醇制汽油中的催化性能
发表时间：2025-06-03
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- 第一作者：
- 何英萍
- 通讯作者：
- 刘民,代成义,徐舒涛,魏迎旭,刘中民,郭新闻
- 发表时间：
- 2022-10-10
- 发表刊物：
- 催化学报
- 文献类型：
- J
- 卷号：
- 34
- 期号：
- 6
- 页面范围：
- 1148-1158
- ISSN号：
- 0253-9837
- 摘要：
- Nanocrystalline ZSM-5 zeolite was modified with tetrapropylammonium hydroxide (TPAOH) solution. The effect of the TPAOH treatment time on the catalytic performance of HZSM-5 was investigated in methanol to gasoline (MTG) reaction. The modified samples were characterized using X-ray diffraction, scanning electron microscopy, Al-27 and Si-29 magic-angle spinning nuclear magnetic resonance spectroscopy, X-ray photoelectron spectroscopy, N-2 adsorption, and NH3 temperature-programmed desorption. The HZSM-5 structure was basically unchanged after modification, but the relative crystallinity increased and the crystal morphology was more regular. The Brunauer-Emmett-Teller surface area, the micropore surface area, the surface Si/Al ratio, and the amount of strong acid sites increased; this might be caused by desilication and dealumination, and secondary crystallization of the zeolite during the treatment. The stability of the catalyst was significantly improved after modification, as reflected by the increased lifetime from 70 h to above 170 h in MTG reaction. The catalyst lifetime increased with increasing TPAOH treatment time. Hydrogen transfer reactions became faster and led to more isoparaffins and less olefins in the liquid products. (c) 2013, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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