通过SAPO-34分子筛笼中引入金属物种提升甲醇制烯烃反应中乙烯选择性（英文）
发表时间：2025-06-03
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- 第一作者：
- 钟家伟
- 通讯作者：
- 韩晶峰,魏迎旭,徐舒涛,孙毯毯,郭新闻,宋春山,刘中民
- 发表时间：
- 2022-10-09
- 发表刊物：
- 催化学报
- 文献类型：
- J
- 卷号：
- 39
- 期号：
- 11
- 页面范围：
- 1821-1831+1914-1920
- ISSN号：
- 0253-9837
- 摘要：
- The SAPO-34 catalysts were modified with metal cations by different processes (conventional ion exchange (CIE), template-assisted ion incorporation (TII) and alcoholic ion exchange (AIE)), systematically characterized by XRD, XRF, N-2 adsorption-desorption, UV-VIS, EPR, SEM, EDX, XPS, NH3-TPD, H-1 NMR and IGA, and applied in MTO reaction. The metal cations incorporation introduces extra diffusion hindrance by metallic species located in the cavity of SAPO-34. In particular, the Zn cations-modified SAPO-34 catalysts exhibit core-shell like structure, with Si-rich and Zn-rich sublayer near the external surface, which favors the coke deposition at the beginning of MTO reaction, exerts marked impact on the diffusion of the generated products with relatively large molecular size (e.g. propylene), and significantly increases the selectivity to ethylene and the ratio of ethylene to propene in the MTO reaction. (C) 2018, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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