Photochemical removal of NO2 in air at atmospheric pressure using side-on type 172-nm Xe2 excimer lamp

M. Tsuji, T. Kawahara, K. Uto, J. Hayashi, T. Tsuji

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1 Citation (Scopus)


The photochemical removal of NO2 in air (1–20% O2) was studied using a side-on type 172-nm Xe2 excimer lamp. The removal rate of NO2 using the side-on lamp (SL), 37.5 min−1, was faster than that using a head-on lamp (HL), 5.4 min−1, with the same input power of 20 W by a factor of 6.9. The energy efficiency for removal of NO2 using the SL was 3.2 g/kWh, which was 12 times higher than that using the HL. Significant enhancement of the removal rate and the energy efficiency using the SL was attributed to a significant increase in the irradiation volume because of a wider irradiation window. Under the SL irradiation, HNO3 was a major final product that differed from N2O5 obtained under the HL irradiation. To obtain the information related to the conversion mechanism of NO2 to HNO3 under 172-nm photolysis in air, computer simulation of the reaction processes was conducted. Results show that the OH + NO2 reaction is a major pathway for the formation of HNO3 in the SL, where OH radicals are formed by 172-nm photolysis of H2O.

Original languageEnglish
Pages (from-to)5685-5694
Number of pages10
JournalInternational Journal of Environmental Science and Technology
Issue number10
Publication statusPublished - Oct 1 2019

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • General Agricultural and Biological Sciences


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