Abstract
The method of differential thermal analysis and Kissinger's approach were used in this study to investigate the kinetics of dehydroxylation and mullitization. The relatively high resistance to the breaking of structural bonds and the diffusion to water molecules through the lamellar gas layer of water vapour limits the activation energy to 178 kJ mol −1, as determined in the experimental work. It is assumed that the relatively moderate activation energy value of mullitization, 487 kJ mol −1, obtained during the exothermic reaction is the result of a moderately defective structure and of the influence of calcium(II) which decreases the activation energy.
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