氯化四-(对氯苯基)铁卟啉催化氧化邻硝基甲苯的表观动力学研究

An apparent kinetics study on oxidation of o-nitrotoluene catalyzed by iron meso-tetra(p-chlorophenyl)porphyrin chloride

研究了氯化四-(对氯苯基)铁卟啉T(p-Cl)PPFeCl催化氧化邻硝基甲苯的表观动力学。在确定邻硝基苯甲醛和邻硝基苯甲酸为主要产物的基础上,建立了连串反应模型和速度方程。根据不同温度条件下所测得的反应速率常数,确立了邻硝基甲苯氧化生成邻硝基苯甲醛的第一步反应为一级反应,且表观活化能为99.5kJ/mol;而邻硝基苯甲醛氧化生成邻硝基苯甲酸的第二步反应为1/2级反应,且表观活化能为82.9kJ/mol。通过比较两步反应的表观活化能和反应速率常数,发现升高温度有利于邻硝基苯甲醛的生成,且反应速率较快。

The apparent kinetics of the oxidation of o-nitrotoluene catalyzed by iron meso-tetra（p-chlorophenyl）porphyrin chloride [T（p-Cl）PPFeCl] was investigated.A consecutive reaction model was established based on o-nitrobenzaldehyde and o-nitrobenzoic acid as the main products of the reaction.The apparent rate constants of two reactions at different temperatures were obtained.The results showed that the first step for oxidation of o-nitrotoluene into o-nitrobenzaldehyde was a first-order reaction with an apparent activation energy of 99.5 kJ/mol,and the second step for oxidation of o-nitrobenzaldehyde into o-nitrobenzoic acid was a half-order reaction with an apparent activation energy of 82.9 kJ/mol.Increasing temperature was favorable for the formation of o-nitrobenzaldehyde along with a faster reaction rate upon comparing apparent activation energies and reaction rate constants of two step reactions.