| Potassium ferrate, a new non-pollution green oxidant, has high selectivity and activity. The effect of pH,temperature,medium,pureness and Fe(Ⅲ) on stability of K2FeO4 in aqueous solution were studied in this text. Along with pH increasing, stability of K2FeO4 was strengthened. With rising in temperature, the stability of K2FeO4 was weakened. When a certain amounts of sodium acetate,sodium oxalate,sodium phosphate were added into the aqueous solution, stabilities of K2FeO4 follow the order :sodium phosphate < sodium oxalate2FeO4, when the concentration ratio of Fe (Ⅲ) and Fe(Ⅵ) is > 2,the stability of FeO42-is very bad. And the pureness of K2FeO4 also affects the stability of K2FeO4 evidently. The higher the pureness,the better the stability. The decomposition kinetics of FeO42- in 10mol·L-1NaOH solution was studied. The experimental results showed that the decomposition reaction rate equation was first order reaction, the reaction activity energy was 58.81kJ ·mol-1, and the decomposition reaction rate equation could be described as: r=9.54×104·exp(-58.81/RT)·CFeO42-Fe(Ⅳ) was synthesized in experiment,its oxidation ability is weaker than Fe(Ⅵ), Fe(Ⅳ) is stable in the aqueous solution. The effect of Fe(Ⅲ) on the stability of Fe(Ⅳ) aqueous solution were not markedly. Benzaldehyde was synthesized by green Fe(Ⅵ) oxidant from toluene in cyclohexane and the optimum reaction conditions were determined:reaction temperature 30℃, reaction time 7 hours, amount of oxidant is the amount of theoretical reaction requirement (m= 0.6589g). At the optimum condition, the conversion of the toluene, the selectivity and yield of the benzaldehyde are 25%, 78.4% and 19.6%, respectively.
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