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题名: Characterization of the acid sites in dealuminated nanosized HZSM-5 zeolite with the probe molecule trimethylphosphine
作者: Zhang, WP;  Han, XW;  Liu, XM;  Bao, XH
关键词: nanosized HZSM-5 zeolite ;  trimethylphosphine (TMP) ;  hydrothermal dealumination ;  P-31 MAS NMR ;  Lewis acid ;  probe molecule
刊名: JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
发表日期: 2003-03-03
卷: 194, 期:1-2, 页:107-113
收录类别: SCI
文章类型: Article
部门归属: 502
项目归属: 502
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The acid sites in dealuminated HZSM-5 zeolite with crystal sizes down to the nanoscale were firstly characterized by the probe molecule trimethylphosphine (TMP). As evidenced by the combination of P-31 CP/MAS NMR, Al-27 MAS and H-1 --> Al-27 CP/MAS NMR measurements, the Bronsted acid sites of both microsized and nanosized HZSM-5 could be decreased upon the dealumination of zeolitic framework after hydrothermal treatment. At the same time, the appearance of Lewis acid sites was observed. The dealuminated nanosized HZSM-5 is easier to form Lewis acid sites than microsized HZSM-5, and the type of Lewis acid sites in nanosized HSM-5 is more than one. In addition, the origin of Lewis acid sites is mainly associated with the aluminum at ca. 30 ppm, in the Al-27 MAS NMR spectra, and only a part of which in the dealuminated HZSM-5 zeolite acts as Lewis acid sites. (C) 2002 Elsevier Science B.V. All rights reserved.
关键词[WOS]: SOLID-STATE NMR ;  ENHANCED ACTIVITY SITES ;  MAS NMR ;  MICROPOROUS STRUCTURE ;  CATALYTIC PROPERTIES ;  SURFACE-ACIDITY ;  ZSM-5 ZEOLITES ;  LEWIS SITES ;  P-31 NMR ;  H-Y
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000181555200012
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/82883
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, XM,et al. Characterization of the acid sites in dealuminated nanosized HZSM-5 zeolite with the probe molecule trimethylphosphine[J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,2003,194(1-2):107-113.
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