过氧化氢法制备二氧化氯反应动力学及机理研究

Kinetics and mechanism study on chlorine dioxide generation with hydrogen peroxide

通过改变反应温度和物料浓度,研究过氧化氢与氯酸钠在硫酸溶液中的反应过程,获得宏观反应动力学方程,并对其反应机理进行了深入探讨。研究表明过氧化氢法制备二氧化氯反应过程中过氧化氢的反应级数为0.5,氯酸钠为1,对于硫酸摩尔浓度的反应级数为5.99,当用酸度函数(h-)代替硫酸摩尔浓度时反应级数则下降为1.64;该反应是吸热过程,反应活化能约为105kJ/mol;机理分析表明该反应是自催化反应过程。

The reaction between hydrogen peroxide and sodium chlorate in presence of aqueous sulfuric acid was studied at various temperatures and molar concentrations of hydrogen peroxide,chlorate and sulfuric acid.The reaction rate law was established by analyzing the consumption of chlorate or hydrogen peroxide.Reaction order is found 0.5 and 1 with respect to hydrogen peroxide and chlorate concentration,respectively.Reaction order is found about 5.99 with respect to molar concentration of sulfuric acid,but it reduces to 1.64 when acidity function(h-),is substituted in place of molar concentration.The reaction is a process of leat absorption and the activation energy is about 105kJ/mol.Reaction mechanism shows it is a self-catalyze reaction.