Kissinger kinetic analysis of data obtained under different heating schedules |
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Authors: | P E Sánchez-Jiménez J M Criado L A Pérez-Maqueda |
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Institution: | 1.Instituto de Ciencia de Materiales de Sevilla,(CSIC-Universidad de Sevilla),Sevilla,Spain |
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Abstract: | The dynamic heating rate method developed by TA Instruments (Hi-ResTM) is a kind of sample controlled thermal analysis in which a linear relationship between the logarithm of the heating rate
and the rate of mass change is imposed. It is shown in this paper that the reacted fraction at the maximum reaction rate strongly
depends on the parameters selected for the Hi-Res heating algorithm, what invalidates the use of the Kissinger method for
analysing Hi-Res data unless that the reaction fits a first order kinetic law. Only in this latter case, it has been demonstrated
that it is not required that a constant value of the reacted fraction at the maximum reaction rate is fulfilled for determining
the activation energy from the Kissinger method. In such a case the Kissinger plot gives the real activation energy, independently
of both the heating schedule used and the value of the reacted fraction, αm, at the maximum. |
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