Publication detail

Isothermal kinetic analysis of the thermal decomposition of kaolinite: The thermogravimetric study

PTÁČEK, P. KUBÁTOVÁ, D. HAVLICA, J. BRANDŠTETR, J. ŠOUKAL, F. OPRAVIL, T.

Original Title

Isothermal kinetic analysis of the thermal decomposition of kaolinite: The thermogravimetric study

Type

journal article in Web of Science

Language

English

Original Abstract

In this kinetic study, the dehydroxylation of the medium ordered kaolinite was investigated under isothermal conditions by the thermogravimetric analysis (TGA). The kinetic model function (mechanism) of the process and important kinetic parameters, i.e. overall activation energy (EA) and pre-exponential (frequency) factor (A), were evaluated from the series of the thermogravimetric experiments in the temperature range from 370 to 500 .C. The linearization procedure on measured data indicates that dehydroxylation of kaolinite and metakaolinite formation up to the temperature 410 .C is controlled by the rate of the second-order chemical reaction. The overall activation energy and frequency factor of dehydroxylation were determined as 257 kJ mol-1 and 1.9x10E19 -1, respectively. Above 410 .C, the course of thermal decomposition of kaolinite corresponds to a third-order reaction with the EA value of 202 kJ mol-1 and 2.9x10E15 s-1, respectively.

Keywords

Kaolin; China-clay; Kaolinite; Metakaolin; Isothermal kinetics; Dehydroxylation; TGA

Authors

PTÁČEK, P.; KUBÁTOVÁ, D.; HAVLICA, J.; BRANDŠTETR, J.; ŠOUKAL, F.; OPRAVIL, T.

RIV year

2010

Released

30. 10. 2010

Publisher

ELSEVIER

Location

NL

ISBN

0040-6031

Periodical

Thermochimica Acta

Year of study

501

Number

1-2

State

Kingdom of the Netherlands

Pages from

24

Pages to

29

Pages count

6

BibTex

@article{BUT50041,
  author="Petr {Ptáček} and Dana {Kubátová} and Jaromír {Havlica} and Jiří {Brandštetr} and František {Šoukal} and Tomáš {Opravil}",
  title="Isothermal kinetic analysis of the thermal decomposition of kaolinite: The thermogravimetric study",
  journal="Thermochimica Acta",
  year="2010",
  volume="501",
  number="1-2",
  pages="24--29",
  issn="0040-6031"
}