TY - JOUR
T1 - Photochemical removal of acetaldehyde using 172 nm vacuum ultraviolet excimer lamp in N 2 or air at atmospheric pressure
AU - Tsuji, Masaharu
AU - Miyano, Masato
AU - Kamo, Naohiro
AU - Kawahara, Takashi
AU - Uto, Keiko
AU - Hayashi, Jun ichiro
AU - Tsuji, Takeshi
N1 - Funding Information:
Funding information This work was supported by JSPS KAKENHI Grant No. 25550056 (2013–2014).
Publisher Copyright:
© 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2019/4/1
Y1 - 2019/4/1
N2 - 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.
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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U2 - 10.1007/s11356-019-04475-w
DO - 10.1007/s11356-019-04475-w
M3 - Article
C2 - 30798499
AN - SCOPUS:85062026187
SN - 0944-1344
VL - 26
SP - 11314
EP - 11325
JO - Environmental Science and Pollution Research
JF - Environmental Science and Pollution Research
IS - 11
ER -
