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The hydrous manganese(IV) oxide, which contained a large amount of alkali and chemically bound water, was prepared from a highly alkaline solution. Then, the hydrous manganese (IV) oxide suspended in aqueous potassium hydroxide solutions was electrolytically oxidized using a nickel anode at a constant current of 3.2 A/dm2 without diaphragm. The electrolysis reaction, in the presence of a small amount of permanganate as an initiator for the oxidation reaction, is believed to take place in two simultaneous reactions, i. e. chemical oxidation and electrolytic oxidation given by:<BR>MnO2+2MnO4-+4OH=3MnO42-+2H2O, MnO4-=MnO4-+e<BR>The current efficiency was found to increase with the increase of the amount of MnO2, free KOH concentration and temperature. This effect is attributed to the fact that the chemical oxidation is the rate determining reaction. However, too much KOH, say more than 5 mol/l, resulted in the decomposition of permanganate into manganate(VI)<BR>A typical set of conditions which realized a high current efficiency was: MnO2; 0.65 mol/l, free KOH; 4.2 mol/l, temperature; 80°C. The effect of additives was also discussed.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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