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Thermal degradation kinetics of sepiolite

Published online by Cambridge University Press:  13 March 2020

Yüksel Sarıkaya ,
Müşerref Önal Open the ORCID record for Müşerref Önal [Opens in a new window]  and
Abdullah Devrim Pekdemir
Yüksel Sarıkaya
Affiliation:
Ankara University, Faculty of Science, Department of Chemistry, Tandoğan, 06100Ankara, Turkey
Müşerref Önal*
Affiliation:
Ankara University, Faculty of Science, Department of Chemistry, Tandoğan, 06100Ankara, Turkey
Abdullah Devrim Pekdemir
Affiliation:
Ankara University, Graduate School of Natural and Applied Sciences, Dışkapı, 06110, Ankara, Turkey
*
*Email: onal@science.ankara.edu.tr
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Abstract

The kinetic parameters of the thermal degradation of sepiolite were evaluated with a new method based on thermal analysis data. Thermogravimetric/differential thermal analysis curves were recorded for the natural and preheated sepiolite samples in the temperature range 25–800°C for 4 h. The temperature-dependent height of the exothermic heat flow peak for the thermal decomposition of sepiolite located at ~850°C on the differential thermal analysis curve was taken as a kinetic variable for the thermal degradation. A thermal change coefficient was defined depending on this variable because this coefficient fit to the Arrhenius equation was assumed as a rate constant for the thermal degradation. The Arrhenius plot showed that the degradation occurs in three steps. Two of these are due to stepwise dehydration and the third originated from dehydroxylation of sepiolite. Three activation energies were obtained that increase with the increasing temperature interval of the steps.

Keywords

decompositiondegradationkineticssepiolitethermal analysis
Type
Brief Report
Information
Clay Minerals , Volume 55 , Issue 1 , March 2020 , pp. 96 - 100
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland, 2020

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Footnotes

Associate Editor: Asuman Turkmenoglu

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