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29Si and 27Al MAS NMR study of the zeolitization of kaolin by alkali leaching

Published online by Cambridge University Press:  09 July 2018

N. Benharrats ,
M. Belbachir ,
A. P. Legrand  and
J. -B. D'espinose de la Caillerie
N. Benharrats*
Affiliation:
LPPMC, Département de Chimie, Faculté des Sciences, Université des Sciences et Technologie, BP 1505, AlM'nouer Oran 31000, Algeria
M. Belbachir
Affiliation:
L.C.P. Département de Chimie, Faculté des Sciences, Université d'Es-Senia, BP 1525, Al M'nouerOran 31000, Algeria
A. P. Legrand
Affiliation:
Systèmes Interfaciauxà l'EchelleNanométrique, FRE CNRS 2312, Laboratoire de Physique Quantique, Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris, 10 rue Vauquelin 75231, Paris cedex 05, France
J. -B. D'espinose de la Caillerie
Affiliation:
Systèmes Interfaciauxà l'EchelleNanométrique, FRE CNRS 2312, Laboratoire de Physique Quantique, Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris, 10 rue Vauquelin 75231, Paris cedex 05, France
*
*E-mail: [email protected]
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Abstract

The alkali leaching of two aluminosilicates, kaolinite and metakaolinite, with aqueous NaOH has been studied. Both silicates gave hydroxysodalite (HS) with or without the evanescent zeolite NaA. X-ray diffraction and high-resolution 29Si and 27Al MAS-NMR spectroscopy provide information about the reaction sequence of the clay. The conversion starts with the formation of an amorphous gel precursor at a rate which depends on the alkali concentration but not on the choice of kaolinite or metakaolinite as starting material. The rate of zeolitization of this gel is much faster when it is obtained from kaolinite, probably because it is more homogeneous.

Keywords

kaolinitezeolitemetakaoliniteX-ray diffraction analysissup29Si and 27Al MAS-NMR spectroscopy
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 1 , March 2003 , pp. 49 - 61
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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