TY - JOUR
T1 - The kinetic study of excited singlet oxygen atom O(1D) reactions with acetylene
AU - Yan, Chao
AU - Teng, Chu C.
AU - Chen, Timothy
AU - Zhong, Hongtao
AU - Rousso, Aric
AU - Zhao, Hao
AU - Ma, Guoming
AU - Wysocki, Gerard
AU - Ju, Yiguang
N1 - Funding Information:
This project is supported by the NSF grants CBET 1903362 and 1507358 , DOE grant DE-SC0020233 of Plasma Science Center, Princeton SEAS innovation grant, ACEE center grant, and Exxon Mobile research grant.
Publisher Copyright:
© 2019 The Combustion Institute
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2020/2
Y1 - 2020/2
N2 - Understanding the multi-channel dynamics of O(1D) reactions with unsaturated hydrocarbon molecules in low temperature reaction kinetics is critically important in stratospheric chemistry, plasma chemistry, plasma assisted fuel reforming, materials synthesis, and plasma assisted combustion. A photolysis flow reactor coupled with highly selective mid-infrared Faraday Rotation Spectroscopy (FRS) and direct ultraviolet-infrared (UV-IR) absorption spectroscopy (DAS) techniques was developed for the first time to study the multi-channel dynamics of excited singlet oxygen atom O(1D) reactions with C2H2 and the kinetics of subsequent reactions. Time-resolved species concentrations of OH, HO2 and H2O were obtained and used to develop a validated kinetic model of O(1D) reactions with C2H2. The branching ratios of O(1D) reaction with C2H2 and subsequent HO2 kinetics were also quantified. It is found that, contrary to O(1D) reactions with saturated alkanes, OH formation via direct H abstraction by O(1D) is negligible. The results revealed that two chain-branching and propagation reactions via direct O(1D) insertion are the major pathways for radical production. The present study clearly demonstrated the advantage of radical detection and kinetic studies using FRS in the effective suppression of absorption interference from non-paramagnetic hydrocarbons.
AB - Understanding the multi-channel dynamics of O(1D) reactions with unsaturated hydrocarbon molecules in low temperature reaction kinetics is critically important in stratospheric chemistry, plasma chemistry, plasma assisted fuel reforming, materials synthesis, and plasma assisted combustion. A photolysis flow reactor coupled with highly selective mid-infrared Faraday Rotation Spectroscopy (FRS) and direct ultraviolet-infrared (UV-IR) absorption spectroscopy (DAS) techniques was developed for the first time to study the multi-channel dynamics of excited singlet oxygen atom O(1D) reactions with C2H2 and the kinetics of subsequent reactions. Time-resolved species concentrations of OH, HO2 and H2O were obtained and used to develop a validated kinetic model of O(1D) reactions with C2H2. The branching ratios of O(1D) reaction with C2H2 and subsequent HO2 kinetics were also quantified. It is found that, contrary to O(1D) reactions with saturated alkanes, OH formation via direct H abstraction by O(1D) is negligible. The results revealed that two chain-branching and propagation reactions via direct O(1D) insertion are the major pathways for radical production. The present study clearly demonstrated the advantage of radical detection and kinetic studies using FRS in the effective suppression of absorption interference from non-paramagnetic hydrocarbons.
KW - Balanced detection
KW - Faraday rotation spectroscopy
KW - Photolysis Herriott cell
KW - Plasma assisted combustion
KW - Singlet oxygen atom
UR - http://www.scopus.com/inward/record.url?scp=85074714929&partnerID=8YFLogxK
U2 - 10.1016/j.combustflame.2019.10.034
DO - 10.1016/j.combustflame.2019.10.034
M3 - Journal article
AN - SCOPUS:85074714929
SN - 0010-2180
VL - 212
SP - 135
EP - 141
JO - Combustion and Flame
JF - Combustion and Flame
ER -