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题名: MAS MMR studies on the dealumination of Zeolite MCM-22
作者: Ma, D;  Deng, F;  Fu, RQ;  Dan, XW;  Bao, XH
刊名: JOURNAL OF PHYSICAL CHEMISTRY B
发表日期: 2001-03-08
DOI: 10.1021/jp003575r
卷: 105, 期:9, 页:1770-1779
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The dealumination of Zeolite MCM-22 by calcination or hydrothermal treatment was investigated by conventional multinuclear solid-state NMR and checked by an ultrahigh-field NMR experiments (19.6 T) with a very fast spin rate (19.1 kHz). The presence or variation of different species (e.g. silanol nest, 4-coordinated framework, 6-coordinated and 5-coordinated extraframework aluminum) during or after dealumination was detected, and their changes were followed. Four tetrahedral framework aluminum sites were identified upon the Al-27 MAS NMR experiments showing chemical shifts at 61.5, 57.0, 53.5, and 50.0 ppm, respectively. After hydrothermal treatment, aluminum at 57.0 ppm which corresponded to T-3, T-4, T-7, T-10, and T-12 sites in the orthorhombic model is preferentially expelled from the zeolitic framework. Moreover, a dehydroxylation process without the release of four-coordinated framework Al also happened, resulting in the presence of a tricoordinated framework aluminum species, which, together with the formation of tetrahedral framework aluminum species, may serve as the Lewis acid site of the zeolite.
关键词[WOS]: NUCLEAR-MAGNETIC-RESONANCE ;  LEWIS-ACID SITES ;  H-1/AL-27 TRAPDOR NMR ;  RESOLUTION AL-27 NMR ;  CATALYTIC PROPERTIES ;  HZSM-5 ZEOLITES ;  BRONSTED-ACID ;  CROSS-POLARIZATION ;  FRAMEWORK ALUMINUM ;  SILICA POLYMORPHS
语种: 英语
WOS记录号: WOS:000167267900016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138928
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:
Ma, D,Deng, F,Fu, RQ,et al. MAS MMR studies on the dealumination of Zeolite MCM-22[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2001,105(9):1770-1779.
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