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An investigation of the roles of surface aluminum and acid sites in the zeolite MCM-22; An investigation of the roles of surface aluminum and acid sites in the zeolite MCM-22
Ma, D; Han, XW; Xie, SJ; Bao, XH; Hu, HB; Au-Yeung, SCF
KeywordAluminum Aluminum Lewis Acids Lewis Acids Nmr Spectroscopy Nmr Spectroscopy Zeolites Zeolites
Source PublicationCHEMISTRY-A EUROPEAN JOURNAL ; CHEMISTRY-A EUROPEAN JOURNAL
2002-01-04 ; 2002-01-04
Volume8Issue:1Pages:162-170
Indexed BySCI ; SCI
SubtypeArticle ; Article
WOS HeadingsScience & Technology ; Science & Technology ; Physical Sciences ; Physical Sciences
WOS SubjectChemistry, Multidisciplinary ; Chemistry, Multidisciplinary
WOS Research AreaChemistry ; Chemistry
WOS KeywordSOLID-STATE NMR ; SOLID-STATE NMR ; H-1 MAS NMR ; H-1 MAS NMR ; NUCLEAR-MAGNETIC-RESONANCE ; NUCLEAR-MAGNETIC-RESONANCE ; H-1/AL-27 TRAPDOR NMR ; H-1/AL-27 TRAPDOR NMR ; HIGH-RESOLUTION NMR ; HIGH-RESOLUTION NMR ; ANGLE-SPINNING NMR ; ANGLE-SPINNING NMR ; CROSS-POLARIZATION ; CROSS-POLARIZATION ; PROBE MOLECULE ; PROBE MOLECULE ; BRONSTED-ACID ; BRONSTED-ACID ; QUADRUPOLAR NUCLEI ; QUADRUPOLAR NUCLEI
AbstractAmmonia 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.; 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.
Language英语 ; 英语
URL查看原文 ; 查看原文
WOS IDWOS:000173248200016 ; WOS:000173248200016
Citation statistics
Cited Times:36[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/84865
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
Ma, D,Han, XW,Xie, SJ,et al. An investigation of the roles of surface aluminum and acid sites in the zeolite MCM-22, An investigation of the roles of surface aluminum and acid sites in the zeolite MCM-22[J]. CHEMISTRY-A EUROPEAN JOURNAL, CHEMISTRY-A EUROPEAN JOURNAL,2002, 2002,8, 8(1):162-170, 162-170.
APA Ma, D,Han, XW,Xie, SJ,Bao, XH,Hu, HB,&Au-Yeung, SCF.(2002).An investigation of the roles of surface aluminum and acid sites in the zeolite MCM-22.CHEMISTRY-A EUROPEAN JOURNAL,8(1),162-170.
MLA Ma, D,et al."An investigation of the roles of surface aluminum and acid sites in the zeolite MCM-22".CHEMISTRY-A EUROPEAN JOURNAL 8.1(2002):162-170.
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