The kinetic analysis of the thermal decomposition of kaolinite by DTG technique |
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Authors: | Petr Ptá ?ek,Franti&scaron ek &Scaron oukal,Tomá &scaron Opravil,Jaromí r Havlica,Ji?í Brand&scaron tetr |
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Affiliation: | Centre for Materials Research, Faculty of Chemistry, Brno University of Technology, Purkyňova 464/118, Brno, CZ-621 00, Czech Republic |
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Abstract: | The thermal decomposition of kaolinite was studied by differential thermogravimetry (DTG) technique under non-isothermal conditions. Samples of industrially treated (washed) kaolin with high content of the medium ordered kaolinite were calcined using a heating rate from 1 to 40 K min− 1. The apparent activation energy and frequency factor for the dehydroxylation of kaolinite was evaluated by Kissinger method as 195 ± 2 kJ × mol− 1 and (8.58 ± 0.33) × 1014 s− 1, respectively. Avrami exponent of the process was estimated using Kissinger empirical kinetic models and Carne equation. |
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Keywords: | Kaolinite Metakaolin Heterogeneous kinetics Dehydroxylation DTG |
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