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Kinetics and thermodynamics of thermal decomposition of NH4NiPO4·6H2O

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Abstract

The single phase NH4NiPO4·6H2O was synthesized by solid-state reaction at room temperature using NiSO4·6H2O and (NH4)3PO4·3H2O as raw materials. XRD analysis showed that NH4NiPO4·6H2O was a compound with orthorhombic structure. The thermal process of NH4NiPO4·6H2O experienced three steps, which involves the dehydration of the five crystal water molecules at first, and then deamination, dehydration of the one crystal water, intramolecular dehydration of the protonated phosphate groups together, at last crystallization of Ni2P2O7. In the DTA curve, the two endothermic peaks and an exothermic peak, respectively, corresponding to the first two steps’ mass loss of NH4NiPO4·6H2O and crystallization of Ni2P2O7. Based on Flynn–Wall–Ozawa equation, and Kissinger equation, the average values of the activation energies associated with the thermal decomposition of NH4NiPO4·6H2O, and crystallization of Ni2P2O7 were determined to be 47.81, 90.18, and 640.09 kJ mol−1, respectively. Dehydration of the five crystal water molecules of NH4NiPO4·6H2O, and deamination, dehydration of the crystal water of NH4NiPO4·H2O, intramolecular dehydration of the protonated phosphate group from NiHPO4 together could be multi-step reaction mechanisms. Besides, the thermodynamic parameters (ΔH ≠, ΔG ≠, and ΔS ≠) of the decomposition reaction of NH4NiPO4·6H2O were determined.

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Acknowledgements

This study was financially supported by the Guangxi Natural Scientific Foundation of China (Grant No. 0832111), and the Guangxi Science and Technology Agency Research Item of China (Grant No. 0895002–9).

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

    Xuehang Wu, Wenwei Wu, Shushu Li, Xuemin Cui & Sen Liao

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  1. Xuehang Wu
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  2. Wenwei Wu
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Correspondence to Wenwei Wu.

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Wu, X., Wu, W., Li, S. et al. Kinetics and thermodynamics of thermal decomposition of NH4NiPO4·6H2O. J Therm Anal Calorim 103, 805–812 (2011). https://doi.org/10.1007/s10973-010-1057-5

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