Complex process activation energy evaluated by combined utilization of differential and integral isoconversional methods
Článekpeer-reviewedpreprint (submitted version)Soubory
Datum publikování
2020
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Elsevier Science BV
Abstrakt
Performance of the differential and integral isoconversional methods of kinetic analysis was evaluated for complex processes with overlapping independent or consequent reaction mechanisms. Novel way of combined interpretation of the activation energy dependences provided by both differential and integral methods was developed, enabling precise determination of the true activation energies of the overlapping sub-processes. Fundamental part of this evaluation method is based on the existence of point of inflexion following the overshoot effect on the differential isoconversional dependence of activation energy on the degree of conversion. This point of inflexion was found to very well coincide with the higher activation energy. The lower true activation energy can be always determined from the integral isoconversional dependence. Universal pattern for interpretation of the isoconversional kinetic methods behavior was confirmed for all sub-processes with asymmetry in the range of <-0.35; 0.35>, covering majority of real-life data.
Rozsah stran
"120003-1"-"120003-14"
ISSN
0022-3093
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Projekt
GA17-11753S/Kinetická analýza komplexních fyzikálně chemických procesů
Zdrojový dokument
Journal of Non-Crystalline Solids, volume 535, issue: May
Vydavatelská verze
https://www.sciencedirect.com/science/article/pii/S0022309320301204?via%3Dihub
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Klíčová slova
kinetic analysis, solid-state, complex process, activation energy, isoconversional methods, kinetická analýza, pevná fáze, komplexní proces, aktivační energie, izokonverzní metoda