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Jun 30, 2006Keywords:
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The Decomposition Kinetics of Solids Thermodynamic Evidence for the Enthalpy Driven Cooling of Reaction Environment Part 2
Abstract
The analysis of non-isothermal kinetic data for the decomposition of calcium carbonate, CaC03 (s) ~ CaO (s) + C02 (g) in flowing nitrogen, shows that the decomposition of solids is accompanied by self-cooling/heating of the reaction environment depending on the sample mass and heating rate. The correctness of the kinetic model is established by the calculation of the enthalpy change of the reaction. This is the thermodynamic evidence of endothermic enthalpy driven cooling of the reaction environment. The enthalpy change LJH = 179.33 kJmol-1 estimated from this work for the dissociation of CaC03 is in agreement with LJH = 179.17 kJmol-1 derived from the enthalpies of formation of the reaction components. The results support the mechanism suggesting heat transport to be the rate-limiting step.
