Titanium(IV)-EDTA complex - Kinetics of thermal decomposition by non-isothermal procedures

被引：20
|
作者：
Guinesi, Luciana S. [1 ]
Ribeiro, C. A. [1 ]
Crespi, Marisa S. [1 ]
Santos, A. F. [1 ]
Capela, Marisa V. [1 ]
机构：
[1] Univ Estadual Paulista, Inst Quim, Dept Quim Analit, BR-14801970 Araraquara, SP, Brazil
来源：
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2006年 / 85卷 / 02期
关键词：
activation energy; kinetic model; non-isothermal kinetics; Ti(IV)-EDTA; TiO2;
D O I：
10.1007/s10973-005-7027-7
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
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.
引用
收藏
页码：301 / 307
页数：7
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