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Development of Microporosity in Clinochlore Upon Heating

Published online by Cambridge University Press:  28 February 2024

F. Villieras ,
J. Yvon ,
J. M. Cases ,
P. de Donato ,
F. Lhote  and
R. Baeza
F. Villieras
Affiliation:
Laboratoire Environnement et Minéralurgie, UA 235 du CNRS, rue du Doyen, Marcel Roubault, BP 40, 54 501 Vandoeuvre les Nancy cedex, France
J. Yvon
Affiliation:
Laboratoire Environnement et Minéralurgie, UA 235 du CNRS, rue du Doyen, Marcel Roubault, BP 40, 54 501 Vandoeuvre les Nancy cedex, France
J. M. Cases
Affiliation:
Laboratoire Environnement et Minéralurgie, UA 235 du CNRS, rue du Doyen, Marcel Roubault, BP 40, 54 501 Vandoeuvre les Nancy cedex, France
P. de Donato
Affiliation:
Laboratoire Environnement et Minéralurgie, UA 235 du CNRS, rue du Doyen, Marcel Roubault, BP 40, 54 501 Vandoeuvre les Nancy cedex, France
F. Lhote
Affiliation:
Centre de Recherches Pétrographiques et Géochimiques, CNRS, 15 rue Notre Dame des Pauvres, BP 20, 54 501, Vandoeuvre les Nancy cedex, France
R. Baeza
Affiliation:
Talc de Luzenac, BP 1162, 31 036, Toulouse cedex, France
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Abstract

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The “modified chlorite structure” forms by the dehydroxylation of the interlayer octahedral sheet of magnesian chlorite at around 500°C and results in a structure with a basal spacing near 27 Â (Brindley and Chang 1974). This process involves drastic textural modifications as indicated by gas adsorption experiments which reveal the formation of structural micropores. Infrared spectroscopy as well as thermogravimetry and mass spectrometric analysis show that these micropores are filled with molecular atmospheric water, carbon dioxide, nitrogen, argon and hydrocarbons which condense once the samples cool down. A high temperature treatment is needed in order to release the different phases. A heterogeneous dehydroxylation mechanism is proposed in which micropores are formed in donor regions and magnesium and oxygen are concentrated in acceptor regions. This leads to a 27 Å structure with micropore zones and enriched interlayer oxide zones alternating along the z-axis of the mineral.

Keywords

ClinochloreDehydroxylationMicropores
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 6 , December 1994 , pp. 679 - 688
Copyright
Copyright © 1994, Clay Minerals Society

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