Kinetics of Solid–Solid Reactions: Influence of the Number of Contact Points
2014
Amaresh, R. | Pathak, Manan | Suresh, A. K.
Dalvi and Suresh (AIChE J. 2011, 57, 1329−1338) proposed a model for the kinetics of a reaction between two particulate solids A and B, where B is the diffusing component, in terms of the average number of contact points NAB between the two types of particles. In the present work, the applicability and validity of the model is studied, taking the formation of tricalcium aluminate from its immediate precursors as a candidate reaction. Partial analytical solutions to the Dalvi–Suresh model have been derived, and a simple parameter-estimation methodology has been developed. The data clearly show an influence of NAB, and use of the Ginstling–Brounshtein model (Appl. Chem. USSR 1950, 23, 1327−1338) for parameter estimation leads to diffusivity values that depend on NAB in a systematic way. Parameters estimated using the Dalvi–Suresh model, on the other hand, show only a random scatter and also show reasonable agreement with the values of diffusivity of Ca in oxides.
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