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Application of simplified version of advanced isoconversional procedure in non-isothermal kinetic study

Thermal decomposition of NH4Co0.9Zn0.1PO4·H2O

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Abstract

The single phase NH4Co0.9Zn0.1PO4·H2O was prepared via solid-state reaction at 80 °C. Based on a simplified version of advanced isoconversional procedure, the values of activation energy E α associated with the first, second, and third stages of the thermal decomposition of NH4Co0.9Zn0.1PO4·H2O were obtained, which demonstrates 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 α, A, and g(α)]. The most probable reaction mechanisms of the first two stages were estimated by the comparison between experimental plots and modeled results. The values of pre-exponential factor A of the two stages were obtained on the basis of E α and the reaction mechanisms. The distributed activation energy model was applied to study the third stage. Besides, some thermodynamic functions of transition state complexes (ΔS ≠, ΔH ≠, and ΔG ≠) of the two stages were also calculated.

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Acknowledgements

This study was financially supported by 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 Nos. 2012GXNSFAA053019 and 0991108); 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

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

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  1. Zhipeng Chen
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  2. Qian Chai
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  3. Sen Liao
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  4. Yu He
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  5. Yu Li
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  6. Wenwei Wu
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  7. Bin Li
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Correspondence to Sen Liao.

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Chen, Z., Chai, Q., Liao, S. et al. Application of simplified version of advanced isoconversional procedure in non-isothermal kinetic study . J Therm Anal Calorim 113, 649–657 (2013). https://doi.org/10.1007/s10973-012-2714-7

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