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

M. Tsuji, T. Kawahara, K. Uto, Hayashi Jun-Ichiro, T. Tsuji

Research output: Contribution to journalArticle

Abstract

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
Volume16
Issue number10
DOIs
Publication statusPublished - Oct 1 2019

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Atmospheric Pressure
atmospheric pressure
Electric lamps
Atmospheric pressure
Photolysis
Air
Head
air
irradiation
Irradiation
Computer Simulation
photolysis
energy efficiency
Energy efficiency
removal
lamp
computer simulation
Computer simulation

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Agricultural and Biological Sciences(all)

Cite this

Photochemical removal of NO2 in air at atmospheric pressure using side-on type 172-nm Xe2 excimer lamp. / Tsuji, M.; Kawahara, T.; Uto, K.; Jun-Ichiro, Hayashi; Tsuji, T.

In: International Journal of Environmental Science and Technology, Vol. 16, No. 10, 01.10.2019, p. 5685-5694.

Research output: Contribution to journalArticle

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