The Reaction between Ferrous Iron and Peroxides. IV. Reaction with Potassium Persulfate1a

来自 Semantic Scholar

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阅读量：

122

作者：

I. M. Kolthoff，A. I. Medalia，Helen Parks Raaen

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摘要：

Upon very slow addition of ferrous iron to an acid (0.5 M sulfuric acid), neutral or alkaline (0.1 M pyrophosphate) persulfate solution, the molar reaction ratio of ferrous iron to persulfate is found less than 2. Upon rapid mixing of the reactants, the stoichiometric reaction ratio of 2 is found in the absence of organic substances. Upon rapid mixing or slow addition of ferrous iron to ethanol containing persulfate solution in the absence of oxygen, Fenton reaction occurs, in which alcohol is oxidized to aldehyde. The reaction ratio is less than 2. Chloride and especially bromide suppress the induced alcohol oxidation, but acetic acid and acetone have no effect. Acrylonitrile suppresses the induced alcohol oxidation; the reaction ratio in the presence of acrylonitrile is close to 1, because the SO4-. radical-ions formed in the reaction between ferrous iron and persulfate are effectively consumed in the initiation of the acrylonitrile polymerization. In the presence of oxygen and organic compounds like ethanol, acetone, acetic acid, reaction ratios greater than 2 are found. The induced oxygen oxidation of ferrous iron is explained. Bromide is an effective suppressor of this induced reaction.

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DOI：

10.1021/ja01148a089

被引量：

681

年份：

1951