Abstract
Both thermogravimetric analysis (TG) and constant rate thermal analysis (CRTA) under high vacuum were applied to the study of the mechanism of thermal decomposition of alkaline-earth carbonates. Proper experimental conditions were used in order to avoid heat and mass transfer phenomena. The kinetic analysis of TG and CRTA curves was carried out taking into account the kinetic laws of the mechanisms of solid state reactions most commonly used in the literature. Good agreement between the activation energy and the Arrhenius pre-exponential factor calculated from both techniques is only obtained when considering that the decomposition of alkaline-earth carbonates follows first-order kinetics. A compensation effect was found for the above reactions between the logarithm of the Arrhenius pre-exponential factor and the activation energy. This behaviour was interpreted by a correlation between the stability of the salts and the mobility of the CO 2- 3 ion present in the activated complex.
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