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

  • M. TsujiEmail author
  • T. Kawahara
  • K. Uto
  • J. Hayashi
  • T. Tsuji
Original Paper


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.


NO2 removal VUV photolysis Excimer lamp Kinetic model simulation 



Head-on lamp


Side-on lamp


Fourier transform infrared


Vacuum ultraviolet


Taiyo Nippon Sanso



The authors wish to thank all who assisted in conducting this work.

Compliance with ethical standards

Conflict of interest

The authors have declared no conflict of interest.


  1. Atkinson R, Baulch DL, Cox RA, Hampson Jr RF, Kerr JA, Rossi MJ, Troe J (1997) J Phys Chem Ref Data 26:1329–1499. Updated data were obtained from NIST Chemical Kinetics Database on the Web,
  2. Devadas M, Kröcher O, Elsener M, Wokaun A, Soger N, Pfeifer M, Demel Y (2006) Influence of NO2 on the selective catalytic reduction of NO with ammonia over Fe-ZSM5. Appl Catal B Environ 67:187–196CrossRefGoogle Scholar
  3. Heck RM, Farrauto RJ, Gulati ST (2009) Catalytic air pollution control: commercial technology, vol 522. Wiley, HobokenCrossRefGoogle Scholar
  4. Nee JB, Lee PC (1997) Detection of O(1D) produced in the photodissociation of O2 in the Schumann–Runge continuum. J Phys Chem A 101:6653–6657CrossRefGoogle Scholar
  5. Nishino N, Hollingsworth SA, Stern AC, Roeselová M, Tobias DJ, Barbara J, Finlayson-Pitts BJ (2014) Interactions of gaseous HNO3 and water with individual and mixed alkyl self-assembled monolayers at room temperature. Phys Chem Chem Phys 16:2358–2367CrossRefGoogle Scholar
  6. Okabe H (1978) Photochemistry of small molecules. Wiley, New YorkGoogle Scholar
  7. Tsuji M, Kawahara M, Senda M, Noda K (2007) Efficient conversion of NO2 into N2 and O2 in N2 and into N2O5 in air by 172-nm Xe2 excimer lamp at atmospheric pressure. Chem Lett 36:376–377CrossRefGoogle Scholar
  8. Tsuji M, Kawahara M, Senda M, Kamo N, Kawahara T, Hishinuma N (2008) Photochemical removal of NO by using 172-nm excimer lamp without using any catalysts. Eng Sci Rep Kyushu Univ 30:294–298.
  9. Tsuji M, Kawahara M, Noda K, Senda M, Sako H, Kamo N, Kawahara T, Kamarudin KSN (2009) Photochemical removal of NO2 by using 172-nm Xe2 excimer lamp in N2 or air at atmospheric pressure. J Hazard Mater 162:1025–1033CrossRefGoogle Scholar
  10. Tsuji M, Kawahara T, Uto K, Kamo N, Miyano M, Hayashi J, Tsuji T (2018) Efficient removal of benzene in air at atmospheric pressure using a side-on type 172 nm Xe2 excimer lamp. Environ Sci Pollut Res 25:18980–18989CrossRefGoogle Scholar
  11. Ye T, Chen D, Yin Y, Liu J, Zeng X (2017) Experimental research of an active solution for modeling in situ activating selective catalytic reduction catalyst. Catalysts 7:258CrossRefGoogle Scholar
  12. Zhang Q, Rui Gao XuF, Zhou Q, Jiang G, Wang T, Chen J, Hu J, Jiang W, Wang W (2014) Role of water molecule in the gas-phase formation process of nitrated polycyclic aromatic hydrocarbons in the atmosphere: a computational study. Environ Sci Technol 48:5051–5057CrossRefGoogle Scholar
  13. Zhao N, Zhang Q, Wang W (2016) Atmospheric oxidation of phenanthrene initiated by OH radicals in the presence of O2 and NOx—a theoretical study. Sci Total Environ 563–564:1008–1015CrossRefGoogle Scholar

Copyright information

© Islamic Azad University (IAU) 2018

Authors and Affiliations

  • M. Tsuji
    • 1
    • 2
    Email author
  • T. Kawahara
    • 2
  • K. Uto
    • 1
  • J. Hayashi
    • 1
    • 2
  • T. Tsuji
    • 3
  1. 1.Institute for Materials Chemistry and Engineering and Research and Education Center of Green TechnologyKyushu UniversityKasugaJapan
  2. 2.Department of Applied Science for Electronics and Materials, Graduate School of Engineering SciencesKyushu UniversityKasugaJapan
  3. 3.Interdisciplinary Factory of Science and Engineering, Department of Materials ScienceShimane UniversityMatsueJapan

Personalised recommendations