Titanium(IV)-EDTA complex - Kinetics of thermal decomposition by non-isothermal procedures
Journal of Thermal Analysis and Calorimetry. Dordrecht: Springer, v. 85, n. 2, p. 301-307, 2006.
Guinesi, Luciana S.
Ribeiro, Clovis Augusto
Crespi, Marisa Spirandeli
Santos, A. F.
Capela, Marisa Veiga
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.