Applicability of the Kissinger equation in thermal analysis
For the most common kinetic models used in heterogeneous reactions, the dependencies on x m = E/RT m (E is the activation energy, T m is the temperature corresponding to maximum process rate, R is the gas constant) on the relative errors (e%) in the determination of the activation energy from the slope of the Kissinger straight line ln(β / T m 2 ) vs. 1/T m (β is the heating rate) are evaluated. It is pointed out that, for x m≥10.7 and all kinetic models, ∣e%∣≤5%. Some possible cases exhibiting high values of ∣e%∣, which can be higher than 10%, are put in evidence and discussed.
KeywordsKissinger equation non-isothermal kinetics
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- 5.E. L. M. Krabbendan-Lattaye, W. P. C. De Klerk and R. E. Krämer, J. Therm. Anal. Cal., 80 (2005) 157.Google Scholar