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Thermal Behavior and Decomposition of Intercalated Kaolinite

Published online by Cambridge University Press:  28 February 2024

Magda Gábor ,
Mária Tóth ,
János Kristóf  and
Gábor Komáromi-Hiller
Magda Gábor
Affiliation:
Institute of Inorganic and Analytical Chemistry, L. Eötvös University, P.O. Box 32, H-1518 Budapest, Hungary
Mária Tóth
Affiliation:
Research Laboratory of Geochemistry of the Hungarian Academy of Sciences, Budapest, Hungary
János Kristóf
Affiliation:
Department of Analytical Chemistry, University of Veszprém, H-8201, Veszprém, P.O. Box 158, Hungary
Gábor Komáromi-Hiller
Affiliation:
Institute of Inorganic and Analytical Chemistry, L. Eötvös University, P.O. Box 32, H-1518 Budapest, Hungary
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Abstract

Intercalation complexes of a Hungarian kaolinite were prepared with hydrazine and potassium acetate. The thermal behavior and decomposition of the kaolinite-potassium acetate complex was studied by simultaneous TA-EGA, XRD, and FTIR methods. The intercalation complex is stable up to 300°C, and decomposition takes place in two stages after melting of potassium acetate intercalated in the interlayer spaces. Dehydroxylation occurred, in the presence of a molten phase, at a lower temperature than for the pure kaolinite. FTIR studies revealed that there is a sequence of dehydroxylation for the various OH groups of intercalated kaolinite. The reaction mechanism was followed up to 1000°C via identification of the gaseous and solid decomposition products formed: H2O, CO2, CO, C3H6O, intercalated phases with basal spacings of 14.1 Å, 11.5 Å, and 8.5 Å as well as elemental carbon, K4H2(CO3)3 · 1.5H2O, K2CO3 · 1.5H2O, and KAlSiO4.

Keywords

Infrared spectroscopyIntercalationKaoliniteThermal AnalysisX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 2 , April 1995 , pp. 223 - 228
Copyright
Copyright © 1995, The Clay Minerals Society

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