Liquid-phase MnO2-modification of clinoptilolite

Liquid-phase MnO2-modification of clinoptilolite Formation mechanism of the MnO2 phase in the reaction of heterogeneous synthesis between Mn2+ and MnO 4 - ions on a solid aluminosilicate surface in aqueous solutions was studied. It was shown that, for lowsilica forms, the Mn2+ ion is oxidized by the MnO 4 - ion uniformly across the grain depth to give the MnO2 phase and manganese manganites. For high-silica materials, the MnO2 phase is formed on the outer surface of grains, with the decomposition of the MnO 4 - ion and formation of the MnO2 phase and molecular oxygen. It was found that, for the clinoptilolite rock used as a solid support, the yield of the MnO2 phase and its distribution over the particle volume depend on the penetration capacity of the MnO 4 - ion into the porous structure of this rock, determined by its composition. It is shown that the amount of the MnO2 phase grows with increasing concentration of the MnO 4 - ion and treatment duration, with the phase thickness being 15–20 and 350–1050 μm for, respectively, high- and low-silica samples. Russian Journal of Applied Chemistry Springer Journals

Liquid-phase MnO2-modification of clinoptilolite

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Pleiades Publishing
Copyright © 2017 by Pleiades Publishing, Ltd.
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
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