The use of the IKP method for evaluating the kinetic parameters and the conversion function of the thermal decomposition of NaHCO₃ from nonisothermal thermogravimetric data

Abstract

Three linear isoconversional methods (Friedman, Flynn-Wall-Ozawa, and Kissinger-Akahira-Sunose) and the invariant kinetic parameters (IKP) method were used in order to examine the kinetics of the nonisothermal decomposition of a sodium bicarbonate (NaHCO 3 ). The objective of the paper is to show the usefulness of the IKP method to determine both the kinetic parameters and the kinetic model of the investigated process. The activation energy (E a ) value obtained by the IKP method is in good agreement with the values obtained by isoconversional methods. The IKP method associated with the criterion of coincidence of kinetic parameters for all heating rates led us to the following kinetic triplet: E a = 95.5 kJ mol −1 , A = 2.65 × 10 10 min −1 , and conversion function f (α) = (1 − α) (first-order reaction model, F1).

The Study of Nonisothermal Kinetics of Dehydration of Gibbsite in a Mixture with Zinc Oxide

“…In , the various aspects of formal kinetics in the solid phase have been discussed. Kinetics of nonisothermal thermolysis of natural minerals , layered double hydroxides , and other materials has been successfully investigated. Kissinger , Ozawa–Flynn–Wall (OFW) , Doyle , and Friedman methods have been used for mathematical processing of nonisothermal kinetic data.…”

The kinetic analysis of non-isothermal carisoprodol reaction in nitrogen atmosphere using the invariant kinetic parameters method

“…It is clear that the average value of Eiso obtained by the FR method is lower than corresponding average values of Eiso obtained using the FWO and KAS methods. These differences could be due to the approximation of the temperature integral that was used in the derivations of the relations that ground the FWO and KAS methods and because of this fact the FWO and KAS methods involve a systematic error in E that does not appear in the FR method [25]. Thus, the activation energies obtained as a function of the conversion from the FR method are more reliable than those obtained from the FWO and KAS methods.…”

Estado del Arte del Potencial de las Espumas de Concreto como Aislantes Acústicos

“…La última consideración la presenta los autores en [34], donde determinan la influencia de la velocidad de calentamiento en el comportamiento de reacción. Se observa que en sus resultados obtuvieron una relación ascendente, pues conforme aumenta la tasa de calentamiento, aumenta el pico de temperatura.…”

“…Se observa que en sus resultados obtuvieron una relación ascendente, pues conforme aumenta la tasa de calentamiento, aumenta el pico de temperatura. Fuente: [34].…”