Summary
The thermal behavior of KH2PO4, NaH2PO4 and Na2HPO4 under non-isothermal conditions using TG method with different heating rates was studied. The values of the reaction rate were processed by means of Friedman’s differential-isoconversional method. A dependence of the activation energy vs. conversion was observed. Therefore a procedure based on the compensation effect (suggested by Budrugeac and Segal) was applied. A less speculative data processing protocol was offered by the non-parametric kinetics method suggested by Serra, Nomen and Sempere. Three steps were observed by non-isothermal heating: a dehydration, a dimerization and a polycondensation. The differences in the intimate reaction mechanism are determined by the initial number of water molecules.
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Vlase, T., Vlase, G. & Doca, N. Kinetics of thermal decomposition of alkaline phosphates. J Therm Anal Calorim 80, 207–210 (2005). https://doi.org/10.1007/s10973-005-0637-2
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DOI: https://doi.org/10.1007/s10973-005-0637-2