Abstract:In this paper, the main factors of NO oxidation efficiency in simulated flue gas by oxygen, and the NOx removal efficiency after oxidation by sodium hydroxide solution were discussed. The inlet NO concentration,reaction temperature,O2 and SO2 concentration in flue gas were investigated in the influence of NO oxidation efficiency. In addtion,The effect of NO oxidation efficiency rate and alkaline aqueous solution on NOx remove rate was investigated.Under the condition of low temperature ,the results show that the increasing NO concentration, oxygen concentration and residence reaction time are beneficial to increase the NO oxidation efficiency .And the NO oxidation efficiency is increased significantly with the increasing the above parameters, and then increases slowly after reaching a certain value,while SO2 concentration had little effect on the NO oxidation in flue gas.The results show that when studied under conditions of mass fraction of NaOH =6% and pH=7, the incresing of NO oxidation efficiency can promote the NOx removal efficiency in simulated flue gas.