甲醛肟与HNO<SUB>2</SUB>氧化还原反应动力学

甲醛肟与HNO₂氧化还原反应动力学

摘要: 用分光光度法研究了高氯酸体系中甲醛肟（FO）与亚硝酸的还原动力学，其动力学方程式为：-dc(HNO₂)/dt = kc(HNO₂)c^1.32(FO)c^0.96(ClO₄^-)，其中在1.0℃时，k ＝(7.55±0.50) (mol/L)^2.28/s，活化能Ea=(65.16±6.52) kJ/mol。增加甲醛肟浓度、高氯酸根浓度和温度，HNO₂还原速度增加，H⁺浓度对还原反应基本无影响。

Abstract: The reaction kinetics between HNO₂and formaldoxime in perchloric acid media were studied by spectrophotometric method. The reaction rate equation was determined as follows: -dc(HNO₂)/dt = kc(HNO₂)c^1.32(FO)c^0.96(ClO₄^-), where k ＝(7.55±0.50) (mol/L)^2.28/s at 1.0℃. The reaction activation energy Ea is (65.16±6.52) kJ/mol. Effects of c(FO), c(H⁺), c(ClO₄) and temperature on the reduction rate of HNO₂ were investigated. HNO₂ can be rapidly reduced by FO under usual conditions. The reaction rate increased while increasing concentration of FO, ClO₄^-and reaction temperature. However, the influence of H⁺ is negligible.