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Dehydration Kinetics of Ulexite by Thermogravimetric Data Using the Coats-Redfern and Genetic Algorithm Method

2003; American Chemical Society; Volume: 42; Issue: 15 Linguagem: Inglês

10.1021/ie020929n

1520-5045

Hüseyin Okur, Çiğdem Eymir,

Inorganic and Organometallic Chemistry

There are various methods for determining the reaction parameters using thermal analysis data. In recent years, genetic algorithms have been considered as a new method for the determination of kinetic parameters. In the present study, calcination kinetics of ulexite was investigated by thermogravimetry (TG) using the Coats−Redfern and genetic algorithm methods. The parameters of reaction (activation energy, frequency factor, and order of reaction) and their relative standard deviations were calculated by the Coats−Redfern and genetic algorithm methods. Also, the results obtained from both methods were compared. For the second region of the dehydration process, the Coats−Redfern method gave meaningless results although the genetic algorithm method gave acceptable results. As a result, it can be said that the Coats−Redfern method would not be used for reactions having low activation energies.