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Application of isoconversional calculation procedure to non-isothermal kinetics study

Part II. Thermal decomposition of NH4CuPO4·H2O

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Abstract

The kinetics of thermal decomposition of NH4CuPO4·H2O was studied using isoconversional calculation procedure. The iterative isoconversional procedure was applied to estimate the apparent activation energy E a; 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 NH4CuPO4·H2O were determined to be 117.7 ± 7.7, 167.9 ± 8.4, and 217.6 ± 45.5 kJ mol−1, 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, 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 a and g(α). Besides, the thermodynamic parameters (ΔS ≠, ΔH ≠, and ΔG ≠) of the two stages were also calculated.

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (No. 21161002), the Key laboratory of new processing technology for nonferrous metals and materials, Ministry of Education, Guangxi University (No. GXKFZ-02), the Guangxi Natural Scientific Foundation of China (Grant No. 0991108 and. 0832111), and the Guangxi Science and Technology Agency Research Item of China (Grant No. 0895002–9).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, Guangxi, China

    Yu He, Sen Liao, Zhipeng Chen, Qian Chai, Yu Li, Yaoyi Su, Wenwei Wu & Bin Li

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  1. Yu He
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  2. Sen Liao
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  3. Zhipeng Chen
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Correspondence to Sen Liao.

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He, Y., Liao, S., Chen, Z. et al. Application of isoconversional calculation procedure to non-isothermal kinetics study. J Therm Anal Calorim 111, 313–321 (2013). https://doi.org/10.1007/s10973-012-2306-6

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