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题名: Investigation of the microporous structure and non-framework aluminum distribution in dealuminated nanosized HZSM-5 zeolite by Xe-129 NMR spectroscopy
作者: Zhang, WP;  Han, XW;  Liu, XC;  Lei, H;  Liu, XM;  Bao, XH
关键词: nanosized zeolite ;  HZSM-5 zeolite ;  microporous structure ;  Xe-129 NMR ;  dealumination ;  non-framework aluminum ;  thermal treatment ;  hydrothermal treatment
刊名: MICROPOROUS AND MESOPOROUS MATERIALS
发表日期: 2002-06-01
卷: 53, 期:1-3, 页:145-152
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Variations in the microporous structure and non-framework aluminum (Al-NF) distribution of HZSM-5 zeolite with a crystal size less than 100 nm dealuminated by thermal and hydrothermal treatment have been investigated by xenon adsorption and Xe-129 NMR spectroscopy. The secondary pores in the nanosized HZSM-5 zeolite are observed directly via Xe-129 NMR spectroscopy. As evidenced by Xe-129 NMR and XPS, for the calcined microsized HZSM-5, most of the Al-NF may deposit on its external surface, a small amount of Al-NF may be located in its channels. However, for the calcined nanosized HZSM-5, most of the Al-NF may be located in the channels, while a small amount of Al-NF may be located on the external surface. After hydrothermal treatment at lower temperature, the distribution of Al-NF in dealuminated nanosized HZSM-5 is heterogeneous. It is not only present in the channels and on the external surface as in the case of microsized HZSM-5, but also near the pore entrances at the outer edge of the crystallites. However, at higher steaming temperatures, more Al-NF in both the microsized and the nanosized HZSM-5 zeolites will migrate to their external surface. (C) 2002 Elsevier Science Inc. All rights reserved.
关键词[WOS]: CHEMICAL-SHIFTS ;  CATALYTIC PROPERTIES ;  CRYSTAL SIZE ;  AL-MFI ;  ZSM-5 ;  SOLIDS ;  STEAM ;  XENON ;  BETA
语种: 英语
WOS记录号: WOS:000176020100014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139158
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Zhang, WP,Han, XW,Liu, XC,et al. Investigation of the microporous structure and non-framework aluminum distribution in dealuminated nanosized HZSM-5 zeolite by Xe-129 NMR spectroscopy[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2002,53(1-3):145-152.
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