关键词:

非平衡等离子体, 气态污染, 降解, 反应动力学模型, 速率常数

Abstract:

A non-equilibrium plasma decomposition reaction kinetics model of gaseous pollutant was developed.The reaction rate constants of various pollutants were obtained by substituting the decomposition experimental data reported from literature into the model equation.The result showed that under different conditions of discharge mode, electrode structure, and operation parameters, the decomposition reaction rate constants were almost unchanged for the same pollutant, which proved that the model had wide applicability and was independent of the discharge mode and reactor structure.The reaction rate constants of pollutants could be classified according to their molecular structure.Then the relationship between reaction rate constant and the dissociation energy of the easiest dissociating chemical bond (EDCB) in pollutant molecule was discussed.It was found that the reaction rate constants of pollutants with lower dissociation energy of EDCB were larger than those of pollutants with a steady structure and higher dissociation energy of EDCB.For example, sulfide, amine, alkene and substituted alkene had much larger reaction rate constants (about 10^-2 m³·W^-1·h^-1) than aromatics, alkane and substituted alkane (10^-4—10^-3 m³·W^-1·h^-1).

Key words:

非平衡等离子体, 气态污染, 降解, 反应动力学模型, 速率常数