A simplified method has been developed for the determination of the activation energy of a heterogeneous reaction having linear kinetics. The thermal decomposition of calcium carbonate has been used as an example and it has been shown that when the logarithm of the weight loss per unit area of powder compacts is plotted against the reciprocal of absolute temperature, for a run done with a linear heating rate, a linear relationship is obtained. When the logarithms of the heating rate and the absolute temperature are included, results for a variety of heating rates can be completely correlated. Heating rates of less than 5 degrees per minute are recommended. An activation energy of 48.4 ± 2 kilocalories per mole has been estimated for the decomposition reaction and 7 ± 3 kilocalories per mole for the formation reaction.
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Ingraham et al. (1964) studied this question.
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