Reconciliation of Arrhenius and iso-conversional analysis kinetics parameters of non-isothermal data

Abstract

Calculations pertaining to nth order analyses of various solid state reaction kinetics models have been extended to consider iso-conversional Arrhenius (i.e. Friedman) analyses. Non-isothermal extent and rate of reaction data for several models, with the same kinetics parameters, generated over a wide heating rate range, are subjected to both Arrhenius and Friedman nth order analyses over the entire extent of reaction range. A necessary model correction for the Friedman preexponential factors is presented and discussed. Calculated extent of reaction as a function of temperature data at a desired heating rate is compared with the original model data and analogous data generated using the single heating rate Arrhenius analyses parameters. Essentially complete agreement is obtained despite the widely disparate values of the Arrhenius and Friedman derived kinetics parameters. Application of this procedure to the analysis of experimental data is discussed.