Fenton试剂氧化降解瓦斯的反应动力学

Kinetics of methane degradation with Fenton reagent

在自制的鼓泡反应器中以氮气平衡的甲烷标准气模拟矿井瓦斯,根据Fenton试剂氧化反应的自由基链反应特性,运用幂函数动力学模型考察了c(H2O2)0,c(Fe2+)0、反应温度等对甲烷氧化降解效率的影响.采用一级反应动力学方程拟合Fenton试剂降解瓦斯的氧化反应动力学方程,得到羟基自由基(·OH)氧化甲烷的表观活化能为7.065kJ/mol,对H2O2与Fe2+的反应级数分别为0.533 4和0.463 0.甲烷降解率的实验值与模型预测值拟合程度很高,相关系数在0.98以上.

Nitrogen-balanced standard methane was used a feed to simulate coal mine gas in an in-house-designed bubbling reactor. Based on the free-radicals chain reaction properties of Fen- ton reagent oxidation, a power-law kinetics model was used to investigate the effects of H2 02 concentration, Fe2＋＂ concentration, and reaction temperature on methane degradation efficien- cy. The oxidative kinetics equation of methane degradation with Fenton reagent was described with a first-order kinetics model. The results show that the reaction activation energy of meth- ane oxidation is 7. 065 kJ/mol, and the reaction orders with respect to H202 and Fe2＋ are 0. 533 4 and 0. 463 0, respectively. The experimental data and model calculation results of methane degradation efficiency has a high degree of fitting with a correlation coefficient greater than 0.98.