Studies on the kinetics of the gibbsite → χ-alumina reaction

György Pokol, Gábor Várhegyi, László Várady

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Constant heating rate and isothermal thermogravimetric measurements, carried out in flowing air and in water vapour atmospheres, were applied in the investigations on the decomposition of mineral gibbsite. Kinetic parameters were estimated from the TG curves. The common rate equations dα dt = k(1 - α)n and k = Ae-E/RT were found to fit the dehydration to χ-alumina quite well. The apparent order of reaction showed differences depending on the experimental conditions, and the pre-exponential factor was found to be dependent on water vapour pressure. The dependence on water vapour pressure could be taken into account by including a driving force factor in the rate equation.

Original languageEnglish
Pages (from-to)237-247
Number of pages11
JournalThermochimica Acta
Volume76
Issue number1-2
DOIs
Publication statusPublished - May 15 1984

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Aluminum Oxide
Steam
Water vapor
water vapor
water pressure
Alumina
aluminum oxides
Vapor pressure
vapor pressure
Kinetics
kinetics
Heating rate
Dehydration
Kinetic parameters
dehydration
Minerals
minerals
Decomposition
decomposition
atmospheres

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Physical and Theoretical Chemistry

Cite this

Studies on the kinetics of the gibbsite → χ-alumina reaction. / Pokol, György; Várhegyi, Gábor; Várady, László.

In: Thermochimica Acta, Vol. 76, No. 1-2, 15.05.1984, p. 237-247.

Research output: Contribution to journalArticle

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