The Kinetic Analysis of Carbide Lime Reaction Based on Multi-Heating Rate Method

Abstract

In this paper, research was focused on the carbide lime decomposition mechanism in pure N2 atmosphere by using thermo-gravimetric analysis with multi-heating rate method. Appling equal conversion rate method, activity energy E was calculated which was equal to 84.79 kJ/mol without proposing decomposition mechanism. A more accurate and reliable method based on multi-heating rate methods was put forward to deduce the mechanism function of above reaction, which was called “master plot methods”. Comparison was done between the theoretical master plots drawn by assuming various kinetic models and the experimental master plot, which allows us to select the probably appropriate kinetic model of the process under investigation. And the further detailed kinetic analysis was achieved as the knowledge of the kinetic model. The results are as follows: the reaction mechanism function f(α)=2.95(1-α)0.661 or G(α)=1-(1-α)0.339, the pre-exponential factor lnA=15.95. And the decomposition mechanism of carbide lime turned out to be the phase boundary shrinking sphere reaction.