27Al Multiple-Quantum MAS NMR of Mechanically-Treated Bayerite (alpha-Al(OH)3) and Silica Mixtures

Sharon Elizabeth Ashbrook, Kenneth JD MacKenzie, Stephen Wimperis

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Two-dimensional Al-27 multiple-quantum magic angle spinning (MQMAS) NMR experiments are used to study mixtures of bayerite (alpha-Al(OH)(3)) with either silicic acid (SiO2.nH(2)O) or silica gel (SiO2) that have been ground together for varying lengths of time. This mechanical treatment produces changes in the Al-27 MAS and MQMAS NMR spectra that correspond to the formation of new Al species. Mean values of the quadrupolar interaction (P-Q) and isotropic chemical shift (delta(CS)) are extracted from the two-dimensional Al-27 NMR spectra for each of these species. The presence of significant distributions of both Al-27 quadrupolar and chemical shift parameters is demonstrated and the effect of grinding duration on the magnitudes of these distributions is discussed. (C) 2001 by Academic Press.

Original languageEnglish
Pages (from-to)87-99
Number of pages13
JournalSolid State Nuclear Magnetic Resonance
Volume20
DOIs
Publication statusPublished - Nov 2001

Keywords

  • ANGLE-SPINNING NMR
  • NUCLEAR-MAGNETIC-RESONANCE
  • SOLID-STATE NMR
  • QUADRUPOLAR NUCLEI
  • MECHANOCHEMICAL PREPARATION
  • ALUMINOSILICATE PRECURSORS
  • ALUMINUM
  • GIBBSITE
  • MULLITE
  • KAOLINITE

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