Abstract
Up to the present, so far as we are aware, the kinetics of reactions directly involving two solid phases have not been examined quantitatively in connection with a theory of the mechanism. Qualitative suggestions have been made ( cp . G. N. Lewis, Macdonald and Hinshelwood) to account for the autocatalysis observed in particular cases of such reactions. Langmuir drew attention to the importance of the interface between the two solid phases for dynamic equilibrium in systems of the type: Solid 1 ⇆Solid 2 + Gas, and Langmuir’s suggestion was applied by Crowther and Coutts to explain the results obtained in a study of the dehydration of certain salt hydrates.

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