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- Title
Application of isoconversional calculation procedure to non-isothermal kinetics study.
- Authors
He, Yu; Liao, Sen; Chen, Zhipeng; Chai, Qian; Li, Yu; Su, Yaoyi; Wu, Wenwei; Li, Bin
- Abstract
The kinetics of thermal decomposition of NHCuPO·HO was studied using isoconversional calculation procedure. The iterative isoconversional procedure was applied to estimate the apparent activation energy E; the values of apparent activation energies associated with the first stage (dehydration), the second stage (deamination), and the third stage(condensation) for the thermal decomposition of NHCuPO·HO were determined to be 117.7 ± 7.7, 167.9 ± 8.4, and 217.6 ± 45.5 kJ mol, respectively, which demonstrate that the third stage is a kinetically complex process, and the first and second stages are single-step kinetic processes and can be described by a unique kinetic triplet [ E, A, g(α)]. A new modified method of the multiple rate iso-temperature was used to define the most probable mechanism g(α) of the two stages; and reliability of the used method for the determination of the kinetic mechanism were tested by the comparison between experimental plot and model results for every heating rate. The results show that the mechanism functions of the two stages are reliable. The pre-exponential factor A of the two stages was obtained on the basis of E and g( α). Besides, the thermodynamic parameters (Δ S, Δ H, and Δ G) of the two stages were also calculated.
- Subjects
ISOTHERMAL processes; CHEMICAL kinetics; CHEMICAL decomposition; THERMAL analysis; COPPER phosphate; SOLID state chemistry; CHEMICAL reactions; THERMODYNAMICS
- Publication
Journal of Thermal Analysis & Calorimetry, 2013, Vol 111, Issue 1, p313
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-012-2306-6