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Magic angle spinning29Si and27Al NMR study of mordenite dealumination

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Abstract

Magic angle spinning29Si 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 the29Si coordination sphere is hampered by the overlap of chemical shift ranges for Si−O−Al and Si−O−H species. MAS27Al NMR indicates the presence of octahedrally coordinated Al in interstitial sites in all treated samples. On treating mordenite samples at high temperatures (∼700°C) much of the Al becomes invisible to the NMR experiment because of its location in sites of low symmetry and large quadrupole coupling constant.

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Authors and Affiliations

  1. Division of Chemistry, National Research Council of Canada, K1A OR9, Ottawa, Ontario, Canada

    J. A. Ripmeester, A. Majid & R. E. Hawkins

Authors
  1. J. A. Ripmeester
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  2. A. Majid
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  3. R. E. Hawkins
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Ripmeester, J.A., Majid, A. & Hawkins, R.E. Magic angle spinning29Si and27Al NMR study of mordenite dealumination. Journal of Inclusion Phenomena 1, 193–198 (1983). https://doi.org/10.1007/BF00656822

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  • DOI: https://doi.org/10.1007/BF00656822

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