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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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. 14. Serra , R , Sempere , J , Nomen , R . A new method for the kinetic study of thermo-analytical data: the non-parametric kinetics method . Thermochim Acta . 1998 ; 316 : 37 10.1016/S0040

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, α ) with extent of conversion (isoconversional method) [ 12 – 14 , 24 – 29 ] and temperature (non-parametric kinetics method) [ 30 , 31 ]. Further, Arrhenius parameters evaluated using model-free techniques facilitate modeling of a degradation

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imperative condition of the separability of both temperature and conversion functions. To check the separability of these functions, the Non-Parametric Kinetics method (NPK), developed by Serra et al. [ 2 ], could be very suitable. The NPK method is based on

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thermoanalytical data: the non-parametric kinetics method . Thermochim Acta . 1998 ; 316 : 37 – 45 . 10.1016/S0040-6031(98)00295-0 . 24. Chrissafis , K . Kinetics of thermal degradation of

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. 30. Serra , R , Nomen , R , Sempere , J 1998 A new method for the kinetic study of thermoanalytical data: the non-parametric kinetics method . Thermochim Acta 316 : 37 – 45 10.1016/S0040

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