鉄シアノ錯体の湿式加熱分解と過酸化水素添加による分解挙動への影響

概要

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In this work, hydrothermal decomposition of [Fe(CN)6]3− in alkaline solution was conducted in a batch-type autoclave. The initial concentration of CN in [Fe(CN)6]3− in the sample solution was set to correspond to 1,000 mg CN/dm3. The experiments were conducted at temperatures of 403-443 K under O2 atmosphere at 0.1-4 MPa pressure. Hydrogen peroxide (H2O2) was used as an oxidation agent to enhance oxidative decomposition of [Fe (CN)6]3−. Moreover, the mechanism of this reaction was discussed.Results show that the rate of hydrothermal decomposition of [Fe (CN)6]3− is independent of O2 partial pressure. The rate is sufficiently described by first-order reaction Kinetics with respect to the [Fe(CN)6]3− concentration. The principal reaction products of cyanate (OCN−), formate (HCOO−), and ammonium (NH4+) ions were detected using ion chromatography. When H2O2 was added to [Fe(CN)6]3− solution, the decomposition rate of CN in [Fe(CN)6]3− at the initial stage of the reaction (0.5-2 h) was found to be 1.2-1.3 times higher than that without H2O2. The reaction products of HCOO−, carbonate (CO32−) and NH4+ ions were detected. Such different reaction products resulting from H2O2 addition suggest the formation of CO32−and N2 during oxidative decomposition of [Fe(CN)6]3− by H2O2.
2009-11-01