XE-129 Nuclear-Magnetic-Resonance Studies of H-GA-MFI zeolites

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Xe-129 Nuclear magnetic resonance (NMR) studies of H-Ga-MFI samples having a range of lattice and extralattice gallium contents have shown that the Xe-129 NMR technique can be used as an estimate of the lattice gallium content and the extent of charge on the extralattice gallium species. The xenon chemical shift extrapolated to zero xenon coverage can be used to estimate the lattice gallium content and the extent of charge on the extralattice gallium species. The xenon chemical shift extrapolated to zero xenon coverage is linearly dependent on the lattice gallium content as determined by Si-29 magic-angle spinning (MAS) NMR spectroscopy. Samples containing high concentrations of extralattice gallium showed a marked upward curvature in plots of xenon chemical shift versus xenon density at low xenon density. Steaming of the zeolites reduces the lattice gallium content and the upward curvature in the xenon chemical shift plots, consistent with hydrolysis of extralattice Ga3+ to uncharged oxide or oxyhydroxide gallium species within the zeolite pores.

Original languageEnglish
Pages (from-to)131-139
Number of pages9
JournalMicroporous and Mesoporous Materials
Volume4
Issue number2-3
DOIs
Publication statusPublished - Jun 1995

Keywords

  • GA-MFI
  • zeolites
  • steaming
  • XE-129 nuclear magnetic resonance
  • GA-71 magic-angle spinning nuclear magnetic resonance
  • NMR-spectroscopy
  • microporous solids
  • xenon
  • gallium
  • aluminium

Cite this

XE-129 Nuclear-Magnetic-Resonance Studies of H-GA-MFI zeolites. / BRADLEY, S M ; Howe, Russell Francis.

In: Microporous and Mesoporous Materials, Vol. 4, No. 2-3, 06.1995, p. 131-139.

Research output: Contribution to journalArticle

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abstract = "Xe-129 Nuclear magnetic resonance (NMR) studies of H-Ga-MFI samples having a range of lattice and extralattice gallium contents have shown that the Xe-129 NMR technique can be used as an estimate of the lattice gallium content and the extent of charge on the extralattice gallium species. The xenon chemical shift extrapolated to zero xenon coverage can be used to estimate the lattice gallium content and the extent of charge on the extralattice gallium species. The xenon chemical shift extrapolated to zero xenon coverage is linearly dependent on the lattice gallium content as determined by Si-29 magic-angle spinning (MAS) NMR spectroscopy. Samples containing high concentrations of extralattice gallium showed a marked upward curvature in plots of xenon chemical shift versus xenon density at low xenon density. Steaming of the zeolites reduces the lattice gallium content and the upward curvature in the xenon chemical shift plots, consistent with hydrolysis of extralattice Ga3+ to uncharged oxide or oxyhydroxide gallium species within the zeolite pores.",
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AU - Howe, Russell Francis

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AB - Xe-129 Nuclear magnetic resonance (NMR) studies of H-Ga-MFI samples having a range of lattice and extralattice gallium contents have shown that the Xe-129 NMR technique can be used as an estimate of the lattice gallium content and the extent of charge on the extralattice gallium species. The xenon chemical shift extrapolated to zero xenon coverage can be used to estimate the lattice gallium content and the extent of charge on the extralattice gallium species. The xenon chemical shift extrapolated to zero xenon coverage is linearly dependent on the lattice gallium content as determined by Si-29 magic-angle spinning (MAS) NMR spectroscopy. Samples containing high concentrations of extralattice gallium showed a marked upward curvature in plots of xenon chemical shift versus xenon density at low xenon density. Steaming of the zeolites reduces the lattice gallium content and the upward curvature in the xenon chemical shift plots, consistent with hydrolysis of extralattice Ga3+ to uncharged oxide or oxyhydroxide gallium species within the zeolite pores.

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KW - steaming

KW - XE-129 nuclear magnetic resonance

KW - GA-71 magic-angle spinning nuclear magnetic resonance

KW - NMR-spectroscopy

KW - microporous solids

KW - xenon

KW - gallium

KW - aluminium

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