A 69Ga and 71Ga MAS NMR study of the gallium analog zeolite ZSM-5

A.P.M. Kentgens; C.R. Bayense; J.H.C. Hooff, van; J.W. Haan, de; L.J.M. Ven, van de

doi:10.1016/0009-2614(91)90051-A

A 69Ga and 71Ga MAS NMR study of the gallium analog zeolite ZSM-5

A.P.M. Kentgens
, C.R. Bayense
, J.H.C. Hooff, van
, J.W. Haan, de
, L.J.M. Ven, van de

Chemical Engineering and Chemistry

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Abstract

69Ga and 71Ga magic-angle-spinning (MAS) NMR spectra of a series of gallium analogue zeolites H—(Ga)ZSM-5, with varying Si/Ga ratios, were obtained at 14.1 and 7.1 T. The quadrupole coupling constant e2qQ/h was deduced from the shift difference of the centre of gravity of the 69Ga and 71Ga resonance. An analysis of the linewidth as a function of the magnetic field shows that the width is not only determined by the second-order quadrupolar broadening, but also by a distribution of chemical shifts. The values obtained for the quadrupole coupling constant and chemical shift distribution are compared to those found for 27Al in H—(Al)ZSM-5. It is argued that the observed differences are related to the different NMR properties of the isotopes, and do not point to any structural changes of the ZSM-5 lattice.

Original language	English
Pages (from-to)	399-403
Journal	Chemical Physics Letters
Volume	176
Issue number	3-4
DOIs	https://doi.org/10.1016/0009-2614(91)90051-A
Publication status	Published - 1991

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title = "A 69Ga and 71Ga MAS NMR study of the gallium analog zeolite ZSM-5",

abstract = "69Ga and 71Ga magic-angle-spinning (MAS) NMR spectra of a series of gallium analogue zeolites H—(Ga)ZSM-5, with varying Si/Ga ratios, were obtained at 14.1 and 7.1 T. The quadrupole coupling constant e2qQ/h was deduced from the shift difference of the centre of gravity of the 69Ga and 71Ga resonance. An analysis of the linewidth as a function of the magnetic field shows that the width is not only determined by the second-order quadrupolar broadening, but also by a distribution of chemical shifts. The values obtained for the quadrupole coupling constant and chemical shift distribution are compared to those found for 27Al in H—(Al)ZSM-5. It is argued that the observed differences are related to the different NMR properties of the isotopes, and do not point to any structural changes of the ZSM-5 lattice.",

author = "A.P.M. Kentgens and C.R. Bayense and \{Hooff, van\}, J.H.C. and \{Haan, de\}, J.W. and \{Ven, van de\}, L.J.M.",

year = "1991",

doi = "10.1016/0009-2614(91)90051-A",

language = "English",

volume = "176",

pages = "399--403",

journal = "Chemical Physics Letters",

issn = "0009-2614",

publisher = "Elsevier B.V.",

number = "3-4",

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TY - JOUR

T1 - A 69Ga and 71Ga MAS NMR study of the gallium analog zeolite ZSM-5

AU - Kentgens, A.P.M.

AU - Bayense, C.R.

AU - Hooff, van, J.H.C.

AU - Haan, de, J.W.

AU - Ven, van de, L.J.M.

PY - 1991

Y1 - 1991

N2 - 69Ga and 71Ga magic-angle-spinning (MAS) NMR spectra of a series of gallium analogue zeolites H—(Ga)ZSM-5, with varying Si/Ga ratios, were obtained at 14.1 and 7.1 T. The quadrupole coupling constant e2qQ/h was deduced from the shift difference of the centre of gravity of the 69Ga and 71Ga resonance. An analysis of the linewidth as a function of the magnetic field shows that the width is not only determined by the second-order quadrupolar broadening, but also by a distribution of chemical shifts. The values obtained for the quadrupole coupling constant and chemical shift distribution are compared to those found for 27Al in H—(Al)ZSM-5. It is argued that the observed differences are related to the different NMR properties of the isotopes, and do not point to any structural changes of the ZSM-5 lattice.

AB - 69Ga and 71Ga magic-angle-spinning (MAS) NMR spectra of a series of gallium analogue zeolites H—(Ga)ZSM-5, with varying Si/Ga ratios, were obtained at 14.1 and 7.1 T. The quadrupole coupling constant e2qQ/h was deduced from the shift difference of the centre of gravity of the 69Ga and 71Ga resonance. An analysis of the linewidth as a function of the magnetic field shows that the width is not only determined by the second-order quadrupolar broadening, but also by a distribution of chemical shifts. The values obtained for the quadrupole coupling constant and chemical shift distribution are compared to those found for 27Al in H—(Al)ZSM-5. It is argued that the observed differences are related to the different NMR properties of the isotopes, and do not point to any structural changes of the ZSM-5 lattice.

U2 - 10.1016/0009-2614(91)90051-A

DO - 10.1016/0009-2614(91)90051-A

M3 - Article

SN - 0009-2614

VL - 176

SP - 399

EP - 403

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 3-4

ER -

A 69Ga and 71Ga MAS NMR study of the gallium analog zeolite ZSM-5

Abstract

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