Detail publikace

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

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

Originální název

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

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

Autoři

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

Rok RIV

2010

Vydáno

30. 10. 2010

Nakladatel

ELSEVIER

Místo

ISSN

0040-6031

Periodikum

Thermochimica Acta

Ročník

501

Číslo

1-2

Stát

Nizozemsko

Strany od

Strany do

Strany počet

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"
}