Reaction Mechanism of NO2 in NO Absorption into Alkaline Solution
GAO Fang LIU Fang ZHANG Jun-feng TONG Zhi-quan, YANG Liu-chun
Department of Environmental Engineering, Xiangtan University Department of Environmental Engineering, Xiangtan University Environmental Engineering Department of Xiangtan University Environmental Engineering Department of Xiangtan University Environmental Engineering Department of Xiangtan University
Abstract：The promoting effect of NO2 on NO absorbing into alkaline solution was studied in a bubble column reactor operated in continuous flow mode and the effects of different process variables such as concentration of alkaline solution, feed concentration of NOx, ratio of NO to NO2 and reaction temperature (283~358 K) were investigated. The results indicated that the absorption of NOx was increased observably in the presence of NO2 and the removal efficiency of NO was higher than that of NO2 when the feed concentration of NOx was above 600′10-6 and the volume ratio of NO/NO2 in the range from 0.5 to 2.0. Furthermore, the ion chromatography analysis on the products showed that there were some non-stationary intermediate species formed from NO absorption induced by NO2 and there may be some novel similar-catalysis mechanisms in the removal of NO by injecting NO2 into alkaline solution.
2012, Vol. 12 
