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Complex process activation energy evaluated by combined utilization of differential and integral isoconversional methods
Authors: Svoboda Roman | Luciano Giorgio
Year: 2020
Type of publication: článek v odborném periodiku
Name of source: Journal of Non-Crystalline Solids
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: "120003-1"-"120003-14"
Titles:
Language Name Abstract Keywords
cze Komplexní proces stanovení aktivační energie pomocí kombinovaného využití diferenciálních a integrálních izokonverzních metod Zpracování kinetických dat pro komplexní proces s překrytými nebo následnými procesy pomocí využití diferenciálních a integrálních izokonverzních metod. kinetická analýza; pevná fáze; komplexní proces; aktivační energie; izokonverzní metoda
eng Complex process activation energy evaluated by combined utilization of differential and integral isoconversional methods 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. Kinetic analysis; Solid-state; Complex process; Activation energy; Isoconversional methods

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