Kinetic triplet evaluation of a complicated dehydration of Co3(PO4)2·8H2O using the deconvolution and the simplified master plots combined with nonlinear regression
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- 作者：Saifon Kullyakool ; Khatcharin Siriwong…
- 关键词：Deconvolution ; Simplified master plots method ; Nonlinear regression ; Kinetic triplet evaluation ; Multi ; step dehydration ; Co3xNi3 ; 3x(PO4)2·8H2O
- 刊名：Journal of Thermal Analysis and Calorimetry
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：127
- 期：3
- 页码：1963-1974
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Physical Chemistry; Analytical Chemistry; Polymer Sciences; Inorganic Chemistry; Measurement Science and Instrumentation;
- 出版者：Springer Netherlands
- ISSN：1588-2926
- 卷排序：127
文摘
Kinetic triplet of the complex decomposition processes of Co3Ni3(PO4)2·8H2O was evaluated for the first time by using the deconvolution method to separate the overlapping DTG curves. After the completion of the deconvolution, five steps of the decomposition were obtained. The activation energy E and the pre-exponential factor A of each step were determined by KAS method. The kinetic compensation effect (KCE) method was applied to identify the individual step of the decomposition. Each master plot was simplified by generating the general equations and combined with the nonlinear regression curve fitting. According to kinetic analysis results obtained from this modified method, it was found that the early four steps of dehydration follow the mechanisms of nucleation and subsequent growth with different n-orders, while the last step occurs in the same mechanism but accompanied by the phase transition (lattice reorientation).