Abstract
The kinetics of the illite dehydroxylation is investigated using data from non-isothermal thermodilatometric experiments. An illitic clay with more than 70 % of illite was thermally treated under several heating rates from 1 to 15 °C min−1 in the dehydroxylation region. Model-free and nonlinear model-fitting methods were used to analyze the data, and their results are discussed. The dehydroxylation of the trans-vacant and cis-vacant illite layers can be described by the Avrami–Erofeev model with the exponent values 1.010 and 2.1, respectively, and the apparent activation energies of 119 and 184 kJ mol−1, respectively. The obtained kinetic parameters were used for the calculation of an optimal heating regime in order to achieve a constant thermal expansion rate in the dehydroxylation region for an illite-based ceramic body.
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Acknowledgements
This work was supported by the grant VEGA 1/0162/15 from the Ministry of Education of the Slovak Republic, grant VII/5/2016 from Constantine the Philosopher University, and by the Czech Science Foundation under the project No. P105/12/G059. The authors are indebted to J. Biber from Inter-ILI Engineering Office (Hungary) for a supply of illite.
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Húlan, T., Trník, A. & Medveď, I. Kinetics of thermal expansion of illite-based ceramics in the dehydroxylation region during heating. J Therm Anal Calorim 127, 291–298 (2017). https://doi.org/10.1007/s10973-016-5873-0
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DOI: https://doi.org/10.1007/s10973-016-5873-0