KINETICS OF THERMAL DECOMPOSITION OF SOLIDS.
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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It is shown that Yerofeyevs equation, which is commonly used for practical purposes, cannot correctly describe the process of thermal decomposition of inorganic crystals, since it applies only to the case of a reaction in a coninuous medium, when the nuclei are formed in the volume. During the thermal decomposition of crystals, the nuclei are formed only on their surface. A solution is given for the problem involving the calculation of the probability of the reaction at a given point of the solid and for the general case of a solid of any shape and for an arbitrary law of formation of nuclei not only on the surface of the solid but also in its volume. The exact solution obtained is analyzed in two limiting cases, and it is shown that the total activation energy depends not only on the nature of the substance, but also on the size and shape of the particles. The theory of similitude was used to find two dimensionless variables which determine the process of thermal decomposition. Author
- Physical Chemistry