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Kinetic study by controlled-transformation rate thermal analysis of the dehydroxylation of kaolinite

Published online by Cambridge University Press:  09 July 2018

P. Dion ,
J.-F. Alcover ,
F. Bergaya ,
A. Ortega ,
P. L. Llewellyn  and
F. Rouquerol
P. Dion
Affiliation:
Centre de Recherche sur la Matière Divisée, CNRS, F-45071 Orléans cedex 2, France
J.-F. Alcover
Affiliation:
Centre de Recherche sur la Matière Divisée, CNRS, F-45071 Orléans cedex 2, France
F. Bergaya*
Affiliation:
Centre de Recherche sur la Matière Divisée, CNRS, F-45071 Orléans cedex 2, France
A. Ortega
Affiliation:
lnstituto de Ciencia de Materiales y Departamento de Quimica Inorganica, Universidad de Sevilla, Spain
P. L. Llewellyn
Affiliation:
Centre de Thermodynamique et de Microcalorimétrie du CNRS, 26 rue du 141, eRIA, F-13331 Marseille cedex 3, France
F. Rouquerol
Affiliation:
Centre de Thermodynamique et de Microcalorimétrie du CNRS, 26 rue du 141, eRIA, F-13331 Marseille cedex 3, France
*
1Corresponding author; e-mail: f.bergaya@cnrs-orleans.fr
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Abstract

Although the kinetics of the dehydroxylation of kaolinite have been widely studied, there is no definitive explanation of its mechanism due to its dependence on a variety of parameters. In this study, the dehydroxylation of kaolinite has been studied using controlled-transformation rate thermal analysis (CRTA), allowing precise control of the reaction rate, and thus of both the temperature and pressure above the sample. Modelling of the experimental results obtained by CRTA as well as those from TEM and MAS-NMR show that two elementary processes (diffusion and firstorder) can occur in competition. At the start of the decomposition the diffusion mechanism is predominant, but as the reaction progresses, the first-order mechanism prevails. It would seem that the importance of each process depends, in particular, on the presence of defects as well as on the local vapour pressure.

Type
Research Article
Information
Clay Minerals , Volume 33 , Issue 2 , June 1998 , pp. 269 - 276
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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