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A reassessment of the 29Si MAS-NMR spectra of sepiolite and aluminated sepiolite

Published online by Cambridge University Press:  09 July 2018

J.-B. D'Espinose de la Caillerie  and
J. J. Fripiat
J.-B. D'Espinose de la Caillerie*
Affiliation:
Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin-Milwaukee, PO Box 413, Milwaukee, Wisconsin 53201, USA
J. J. Fripiat
Affiliation:
Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin-Milwaukee, PO Box 413, Milwaukee, Wisconsin 53201, USA
*
*Current address: Ecole Supèrieure de Physique de Physique et de Chimie lndustrielle, Laboratoire de Physique Quantique, 10 rue Vauquelin, 75231 Paris Cedex 05, France.
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Abstract

A 29Si MAS-NMR one-pulse and ﹛1H﹜ CP comparative study of sepiolite, folded sepiolite, aluminated sepiolite, and palygorskite was conducted. The three main resonances of sepiolite at -92.0 ± 0.1, —94.3 + 0.1, and — 97.8 ± 0.1 p.p.m. were assigned with respect to the position of the Si atoms within the three pairs of symmetrical sites in the basal plane. The line at —97.8 p.p.m. was attributed to the central sites by comparison with the resonances and chemical environments of Si in talc and palygorskite. The line at —94.3 p.p.m. was attributed to the edge sites, because it is strongly reinforced by cross-polarization. Alumination of sepiolite led to a broadening of the peaks and new downfield resonances in line with what can be observed in other phyllosilicates and zeolites.

Type
Research Article
Information
Clay Minerals , Volume 29 , Issue 3 , September 1994 , pp. 313 - 318
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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