Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 3245 - 3254 (1986)
Update date:2022-08-10
Topics:
Segal, Michael G.
Williams, William J.
A detailed study of the oxidative dissolution of chromium(III) oxide (Cr2O3) in potassium permanganate is reported.The kinetics of the reaction follow an inverse-cubic rate law under both acid and alkaline conditions; no inhibition by MnO2 product is observed.In alkaline solution, in the temperature range 43-140 degC, the rate exhibits dependences on permanganate and hydroxide concentrations which are explained in terms of a Langmuirian adsorption mechanism.The rate of dissolution is controlled by electron transfer within a surface complex in which bot OH(1-) and MnO4(1-) are bound.Thermodynamic parameters imply chemical bond formation between permanganate and ions in the oxide surface.A study in dilute HNO3 shows that adsorption of MnO4(1-) is also a prerequisite for reaction under acid conditions.
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