Investigation of the microporous structure and non-framework aluminum distribution in dealuminated nanosized HZSM-5 zeolite by Xe-129 NMR spectroscopy

	Investigation of the microporous structure and non-framework aluminum distribution in dealuminated nanosized HZSM-5 zeolite by Xe-129 NMR spectroscopy
	Zhang, WP; Han, XW; Liu, XC; Lei, H; Liu, XM; Bao, XH
刊名	microporous and mesoporous materials
	2002-06-01
卷号	53 期号:1-3 页码:145-152
关键词	nanosized zeolite HZSM-5 zeolite microporous structure Xe-129 NMR dealumination non-framework aluminum thermal treatment hydrothermal treatment
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.
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
关键词[WOS]	chemical-shifts ; catalytic properties ; crystal size ; al-mfi ; zsm-5 ; solids ; steam ; xenon ; beta
收录类别	SCI
语种	英语
WOS记录号	WOS:000176020100014
公开日期	2015-11-10
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/139158]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	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.
APA	Zhang, WP,Han, XW,Liu, XC,Lei, H,Liu, XM,&Bao, XH.(2002).Investigation of the microporous structure and non-framework aluminum distribution in dealuminated nanosized HZSM-5 zeolite by Xe-129 NMR spectroscopy.microporous and mesoporous materials,53(1-3),145-152.
MLA	Zhang, WP,et al."Investigation of the microporous structure and non-framework aluminum distribution in dealuminated nanosized HZSM-5 zeolite by Xe-129 NMR spectroscopy".microporous and mesoporous materials 53.1-3(2002):145-152.