Several commercial grade electrolytic manganese dioxides (EMD's) of gamma variety were converted to
normalbeta‐MnO2
by digesting in 1M sulfuric acid containing Mn2+ at various temperatures. The transformation was found to be catalyzed by Mn2+ and accelerated at high temperatures. The pseudo first‐order rate constants of EMD transformation were evaluated and an activation energy determined to be in the range of 98–115 kJ/mol. This value was very close to the activation energy of 94–100 kJ/mol for desorption of the type II water in EMD lattice. A mechanism involving the equilibrium between EMD and Mn2+, and liberation of the bound water was, thus, proposed.
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