Abstract
The author develops two kinetic models for the reactions given by the chemical equation aA(s) + bB(s) → cC(s) + dD(s) occurring in powdered samples. One of the models deals with reactions limited by the nucleation on contact surfaces between grains, the other one with reactions limited by crystallization of products C and D. What is novel is taking into account the dispersion degree of reactants and the settling degree of the sample as well as the change of the mean grain radius with the conversion degree.
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