Open AccessMagic angle spinning29Si and27Al NMR study of mordenite dealumination
Author(s) -
John A. Ripmeester,
Abdul Majid,
R. E. Hawkins
Publication year - 1983
Publication title -
journal of inclusion phenomena
Language(s) - English
Resource type - Journals
eISSN - 2214-7225
pISSN - 0167-7861
DOI - 10.1007/bf00656822
Subject(s) - mordenite , chemistry , magic angle , quadrupole , fluorine 19 nmr , crystallography , analytical chemistry (journal) , nuclear magnetic resonance spectroscopy , zeolite , stereochemistry , physics , organic chemistry , atomic physics , catalysis
Magic angle spinning \ub2\u2079Si NMR presents a rapid qualitative method of assessing the degree of dealumination of sodium mordenite modified by acid leaching and heat treatment. A quantitative determination of the \ub2\u2079Si coordination sphere is hampered by the overlap of chemical shift ranges for Si-O-A1 and Si-O-H species. MAS \ub2\u2077Al NMR indicates the presence of oetahedrally coordinated A1 in interstitial sites in all treated samples. On treating mordenite samples at high temperatures (~700\ub0C) much of the A1 becomes invisible to the NMR experiment because of its location in sites of low symmetry and large quadrupole coupling constant.Peer reviewed: YesNRC publication: Ye
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