A nonlinear algorithm has been suggested to increase the accuracy of evaluating the activation energy by the integral isoconversional method. A minor modification of the algorithm has made it possible to adapt the isoconversional method for an arbitrary variation of the temperature. This advanced isoconversional method allows for trustworthy estimates of the activation energy when the thermal effect of a reaction makes the temperature of a sample deviate from a prescribed heating program.
The pyrolysis of wheat straw has been carried out by means of thermogravimetric analysis in inert atmosphere. The samples
were heated over a range of temperatures that includes the entire range of pyrolysis with three different heating rates of
5, 10 and 20 K min−1. The activation energy values as a function of the extent of conversion for the pyrolysis process of wheat straw have been
calculated by means of the Flynn–Wall–Ozawa isoconversional method, the Vyazovkin–Sbirrazzuoli isoconversional method and
an iterative isoconversional method presented in this article. The results have showed that there are small differences between
the activation energy values obtained from the three methods, and the pyrolysis process reveals a dependence of the activation
energy on conversion and have indicated the validity of the iterative integral isoconversional method. The effective activation
energy for the pyrolysis of wheat straw is 130–175 kJ mol−1 in the conversion range of 0.15–0.85. Furthermore, the prediction of the pyrolysis process under isothermal conditions from
the dependence of the activation energy on the extent of conversion has been presented.
Authors:J. Criado, P. Sánchez-Jiménez, and L. Pérez-Maqueda
A critical study of the use of isoconversional methods for the kinetic analysis of non-isothermal data corresponding to processes
with either a real or an apparent variation of the activation energy, E, with the reacted fraction, α, has been carried out using for the first time simulated curves. It has been shown that the
activation energies obtained from model-free methods are independent of the heating rate. However, the activation energy shows
a very strong dependence of the range of heating rates used for simulating the curves if the apparent change of E with α is caused by overlapping processes with different individual activation energies. This criterion perhaps could be
used for determining if a real dependence between E and α is really occurring.
(activation energy, pre-exponential factor, and conversion function) of each degradation step is one important target of kinetic investigations. Many kinetic analysis methods have been developed, among which isoconversionalmethods have been widely used [ 1
Authors:P. Budrugeac, D. Homentcovschi, and E. Segal
The differential and integral isoconversional methods for evaluation the activation energy, described in the first note of
this series, were applied for:
a) simulated data for two successive reactions;
b) dehydration of calcium oxalate monohydrate.
It was shown that for these systems the activation energy depends on the conversion degree as well as on the method of evaluation.
Authors:P. Budrugeac, J. Criado, F. Gotor, C. Popescu, and E. Segal
The isoconversional methods (Friedman and Flynn-Wall-Ozawa) as well as the invariant kinetic parameters method (IKP) were
used in order to work the TG data corresponding to the thermal dissociation of smithsonite. As a result we mention a mechanism
change at T≈671 K. For T>671 K, which corresponds to heating rates in the range 0.57– 8.06 K min–1, a reaction order model with 1<n≤1.4 describes the experimental data.
Authors:J. Suñol, J. Saurina, R. Berlanga, D. Herreros, P. Pagès, and F. Carrasco
A crystallization kinetics analysis of several polypropylene-polyethylene (PP-PE), PP-rich copolymers was made by means of
differential scanning calorimetry. The crystallization was studied via calorimetric measurements at different cooling rates.
Several additives were added to the base material. Some test samples were subjected to artificial ageing processes. A modified
isoconversional method was used to describe the crystallization process under non-isothermal conditions. The value of the
Avrami parameter was determined for primary and secondary crystallization.