Efficient Conversion of NO2 into N2 and O2 in N2 or into N2O5 in Air by 172-nm Xe2 Excimer Lamp at Atmospheric Pressure

摘要

Decomposition of NO2(200 ppm)in N2 or air by 172-nm Xe2 excimer lamp was studied at 1 atm.The NO2 conversion in N2 was 99%,and the formation ratios of N2,O2,NO,and N2O were 47,98,0,and 2%,respectively,after 30 min irradiation.The NO2 in air(5-20% O2)could be completely converted to N2O5 and HNO3 due to reactions by O3 and H2O after only 1.0-1.5 min irradiation.The present results give a new simple photochemical aftertreatment technique of NO2 in air without using any catalysts.