Photochemical removal of acetaldehyde using 172 nm vacuum ultraviolet excimer lamp in N 2 or air at atmospheric pressure

Masaharu Tsuji, Masato Miyano, Naohiro Kamo, Takashi Kawahara, Keiko Uto, Hayashi Jun-Ichiro, Takeshi Tsuji

Research output: Contribution to journalArticle

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Abstract

The photochemical removal of acetaldehyde was studied in N 2 or air (O 2 1–20%) at atmospheric pressure using side-on and head-on types of 172 nm Xe 2 excimer lamps. When CH 3 CHO was decomposed in N 2 using the head-on lamp (HL), CH 4 , CO, and CO 2 were observed as products in FTIR spectra. The initial removal rate of CH 3 CHO in N 2 was ascertained as 0.37 min −1 . In air (1–20% O 2 ), HCHO, HCOOH, CO, and CO 2 were observed as products in FTIR spectra. The removal rate of CH 3 CHO in air using the side-on lamp (SL) increased from 3.2 to 18.6 min −1 with decreasing O 2 concentration from 20 to 1%. It also increased from 2.5 to 3.7 min −1 with increasing CH 3 CHO concentration from 150 to 1000 ppm at 20% O 2 . The best energy efficiency of the CH 3 CHO removal using the SL in a flow system was 2.8 g/kWh at 1% O 2 . Results show that the contribution of O( 1 D) and O 3 is insignificant in the initial decomposition of CH 3 CHO. It was inferred that CH 3 CHO is initially decomposed by the O( 3 P) + CH 3 CHO reaction at 5–20% O 2 , whereas the contribution of direct vacuum ultraviolet (VUV) photolysis increases concomitantly with decreasing O 2 pressure at < 5% O 2 . After initial decomposition of CH 3 CHO, it was oxidized further by reactions of O( 3 P), OH, and O 3 with various intermediates such as HCHO, HCOOH, and CO, leading to CO 2 as a final product.

Original languageEnglish
Pages (from-to)11314-11325
Number of pages12
JournalEnvironmental Science and Pollution Research
Volume26
Issue number11
DOIs
Publication statusPublished - Apr 1 2019

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Atmospheric Pressure
Acetaldehyde
acetaldehyde
Carbon Monoxide
Vacuum
Electric lamps
atmospheric pressure
Atmospheric pressure
Air
air
Fourier Transform Infrared Spectroscopy
decomposition
Decomposition
Photolysis
photolysis
Head
energy efficiency
Energy efficiency
lamp
removal

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Photochemical removal of acetaldehyde using 172 nm vacuum ultraviolet excimer lamp in N 2 or air at atmospheric pressure . / Tsuji, Masaharu; Miyano, Masato; Kamo, Naohiro; Kawahara, Takashi; Uto, Keiko; Jun-Ichiro, Hayashi; Tsuji, Takeshi.

In: Environmental Science and Pollution Research, Vol. 26, No. 11, 01.04.2019, p. 11314-11325.

Research output: Contribution to journalArticle

Tsuji, Masaharu ; Miyano, Masato ; Kamo, Naohiro ; Kawahara, Takashi ; Uto, Keiko ; Jun-Ichiro, Hayashi ; Tsuji, Takeshi. / Photochemical removal of acetaldehyde using 172 nm vacuum ultraviolet excimer lamp in N 2 or air at atmospheric pressure In: Environmental Science and Pollution Research. 2019 ; Vol. 26, No. 11. pp. 11314-11325.
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abstract = "The photochemical removal of acetaldehyde was studied in N 2 or air (O 2 1–20{\%}) at atmospheric pressure using side-on and head-on types of 172 nm Xe 2 excimer lamps. When CH 3 CHO was decomposed in N 2 using the head-on lamp (HL), CH 4 , CO, and CO 2 were observed as products in FTIR spectra. The initial removal rate of CH 3 CHO in N 2 was ascertained as 0.37 min −1 . In air (1–20{\%} O 2 ), HCHO, HCOOH, CO, and CO 2 were observed as products in FTIR spectra. The removal rate of CH 3 CHO in air using the side-on lamp (SL) increased from 3.2 to 18.6 min −1 with decreasing O 2 concentration from 20 to 1{\%}. It also increased from 2.5 to 3.7 min −1 with increasing CH 3 CHO concentration from 150 to 1000 ppm at 20{\%} O 2 . The best energy efficiency of the CH 3 CHO removal using the SL in a flow system was 2.8 g/kWh at 1{\%} O 2 . Results show that the contribution of O( 1 D) and O 3 is insignificant in the initial decomposition of CH 3 CHO. It was inferred that CH 3 CHO is initially decomposed by the O( 3 P) + CH 3 CHO reaction at 5–20{\%} O 2 , whereas the contribution of direct vacuum ultraviolet (VUV) photolysis increases concomitantly with decreasing O 2 pressure at < 5{\%} O 2 . After initial decomposition of CH 3 CHO, it was oxidized further by reactions of O( 3 P), OH, and O 3 with various intermediates such as HCHO, HCOOH, and CO, leading to CO 2 as a final product.",
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AU - Jun-Ichiro, Hayashi

AU - Tsuji, Takeshi

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AB - The photochemical removal of acetaldehyde was studied in N 2 or air (O 2 1–20%) at atmospheric pressure using side-on and head-on types of 172 nm Xe 2 excimer lamps. When CH 3 CHO was decomposed in N 2 using the head-on lamp (HL), CH 4 , CO, and CO 2 were observed as products in FTIR spectra. The initial removal rate of CH 3 CHO in N 2 was ascertained as 0.37 min −1 . In air (1–20% O 2 ), HCHO, HCOOH, CO, and CO 2 were observed as products in FTIR spectra. The removal rate of CH 3 CHO in air using the side-on lamp (SL) increased from 3.2 to 18.6 min −1 with decreasing O 2 concentration from 20 to 1%. It also increased from 2.5 to 3.7 min −1 with increasing CH 3 CHO concentration from 150 to 1000 ppm at 20% O 2 . The best energy efficiency of the CH 3 CHO removal using the SL in a flow system was 2.8 g/kWh at 1% O 2 . Results show that the contribution of O( 1 D) and O 3 is insignificant in the initial decomposition of CH 3 CHO. It was inferred that CH 3 CHO is initially decomposed by the O( 3 P) + CH 3 CHO reaction at 5–20% O 2 , whereas the contribution of direct vacuum ultraviolet (VUV) photolysis increases concomitantly with decreasing O 2 pressure at < 5% O 2 . After initial decomposition of CH 3 CHO, it was oxidized further by reactions of O( 3 P), OH, and O 3 with various intermediates such as HCHO, HCOOH, and CO, leading to CO 2 as a final product.

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