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题名: An investigation of the roles of surface aluminum and acid sites in the zeolite MCM-22
作者: Ma, D;  Han, XW;  Xie, SJ;  Bao, XH;  Hu, HB;  Au-Yeung, SCF
关键词: aluminum ;  Lewis acids ;  NMR spectroscopy ;  zeolites
刊名: CHEMISTRY-A EUROPEAN JOURNAL
发表日期: 2002-01-04
卷: 8, 期:1, 页:162-170
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Ammonia adsorption studies reveal that the observed Lewis acidity in the zeolite MCM-22 is derived from at least two types of framework aluminum sites (Al(F)), that is, octahedral Al(F) and three-coordinate Al(F). Comparative ammonia or trimethylphosphine (TMP) adsorption experiments with MCM-22 confirm that octahedral Al species gives rise to the signal at delta(ISO) approximate to 0 in the (27)Al NMR spectrum; this is a superposition of two NMR signals from the different Al species on the water-re constructed zeolite surface. A sharp resonance assigned to framework Al reversibly transforms on ammonia adsorption to delta(ISO) (27)Al approximate to 55 from tetrahedral Al(F), while the broad peak is assigned to nonframework aluminium which results from hydrothermal treatment. This study also demonstrates the effectiveness of (27)Al magic angle spinning (MAS) and multiple quantum (MQ) MAS NMR spectroscopy as a technique for the study of zeolite reactions.
关键词[WOS]: SOLID-STATE NMR ;  H-1 MAS NMR ;  NUCLEAR-MAGNETIC-RESONANCE ;  H-1/AL-27 TRAPDOR NMR ;  HIGH-RESOLUTION NMR ;  ANGLE-SPINNING NMR ;  CROSS-POLARIZATION ;  PROBE MOLECULE ;  BRONSTED-ACID ;  QUADRUPOLAR NUCLEI
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000173248200016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/84865
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
2.Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China

Recommended Citation:
Ma, D,Han, XW,Xie, SJ,et al. An investigation of the roles of surface aluminum and acid sites in the zeolite MCM-22[J]. CHEMISTRY-A EUROPEAN JOURNAL,2002,8(1):162-170.
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