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Kinetics and thermodynamics of thermal decomposition of synthetic AlPO4·2H2O

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Abstract

The non-isothermal kinetics of dehydration of AlPO4·2H2O was studied in dynamic air atmosphere by TG–DTG–DTA at different heating rates. The result implies an important theoretical support for preparing AlPO4. The AlPO4·2H2O decomposes in two step reactions occurring in the range of 80–150 °C. The activation energy of the second dehydration reaction of AlPO4·2H2O as calculated by Kissinger method was found to be 69.68 kJ mol−1, while the Avrami exponent value was 1.49. The results confirmed the elimination of water of crystallization, which related with the crystal growth mechanism. The thermodynamic functions (ΔH*, ΔG* and ΔS*) of the dehydration reaction are calculated by the activated complex theory. These values in the dehydration step showed that it is directly related to the introduction of heat and is non-spontaneous process.

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Acknowledgements

The authors would like to thank the Chemistry Department, Khon Kaen University for providing research facilities. This work is financially supported by King Mongkut’s Institute of Technology Ladkrabang (KMITL) and the Center excellence for Innovation in Chemistry: Postgraduate Education and Research Program in Chemistry (PERCH-CIC), Ministry of Education, Thailand.

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Authors and Affiliations

  1. King Mongkut’s Institute of Technology Ladkrabang, Chumphon Campus, 17/1M. 6 Pha Thiew District, Chumphon, 86160, Thailand

    Banjong Boonchom

  2. Department of Chemistry, Center of Excellence for Innovation in Chemsitry: Postgraduate Education and Research (PERCH-CIC), Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand

    Chanaiporn Danvirutai

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  1. Banjong Boonchom
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  2. Chanaiporn Danvirutai
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Correspondence to Chanaiporn Danvirutai.

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Boonchom, B., Danvirutai, C. Kinetics and thermodynamics of thermal decomposition of synthetic AlPO4·2H2O. J Therm Anal Calorim 98, 771–777 (2009). https://doi.org/10.1007/s10973-009-0292-0

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