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Study of kinetics and thermodynamics of the dehydration reaction of AlPO4 · H2O

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Abstract

The kinetics and thermodynamics of the thermal dehydration of aluminum phosphate monohydrate, AlPO4 · H2O were studied using thermogravimetry (TG-DTG-DTA) at four heating rates in dry air atmosphere. The activation energies of the dehydration step of AlPO4 · H2O were calculated through the methods of Friedman (FR) and Flynn–Wall–Ozawa (FWO) and the possible conversion function has been estimated through the Achar and Li–Tang equations. The independent activation energies on extent of conversions and the better kinetic model of the dehydration reaction for AlPO4 · H2O indicate single kinetic mechanism and the F 2.05 model as a simple n-order reaction of “chemical process or mechanism no-invoking equation”, respectively. The positive values of ΔH# and ΔG# for the dehydration reaction show that it is endothermic and non-spontaneous process and it is connected with the introduction of heat. The kinetic and thermodynamic functions calculated for the dehydration reaction by different techniques and methods were found to be consistent.

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Acknowledgment

The authors would like to thank the Chemistry and Physics Departments, Khon Kaen University for providing research facilities. This work is financially supported by Thailand Research Fund (TRF) and the Commission on Higher Education (CHE): Research Grant for New Scholar (MRG5280073), Ministry of Science and Technology, Thailand.

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Authors and Affiliations

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

    Banjong Boonchom

  2. Department of Chemistry, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand

    Banjong Boonchom & Samart Kongtaweelert

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  1. Banjong Boonchom
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Correspondence to Banjong Boonchom.

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Boonchom, B., Kongtaweelert, S. Study of kinetics and thermodynamics of the dehydration reaction of AlPO4 · H2O. J Therm Anal Calorim 99, 531–538 (2010). https://doi.org/10.1007/s10973-009-0113-5

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  • DOI: https://doi.org/10.1007/s10973-009-0113-5

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