Titanium(IV)-EDTA complex - Kinetics of thermal decomposition by non-isothermal procedures
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Data
2006-01-01
Autores
Guinesi, Luciana S.
Ribeiro, Clovis Augusto [UNESP]
Crespi, Marisa Spirandeli [UNESP]
Santos, A. F.
Capela, Marisa Veiga [UNESP]
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Editor
Springer
Resumo
This work aims the evaluation of the kinetic triplets corresponding to the two successive steps of thermal decomposition of Ti(IV)-ethylenediaminetetraacetate complex. Applying the isoconversional Wall-Flynn-Ozawa method on the DSC curves, average activation energy: E=172.4 +/- 9.7 and 205.3 +/- 12.8 kJ mol(-1), and pre-exponential factor: logA = 16.38 +/- 0.84 and 18.96 +/- 1.21 min(-1) at 95% confidence interval could be obtained, regarding the partial formation of anhydride and subsequent thermal decomposition of uncoordinated carboxylate groups, respectively.From E and logA values, Dollimore and Malek methods could be applied suggesting PT (Prout-Tompkins) and R3 (contracting volume) as the kinetic model to the partial formation of anhydride and thermal decomposition of the carboxylate groups, respectively.
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Palavras-chave
activation energy, kinetic model, non-isothermal kinetics, Ti(IV)-EDTA, TiO2
Como citar
Journal of Thermal Analysis and Calorimetry. Dordrecht: Springer, v. 85, n. 2, p. 301-307, 2006.