The kinetic study of excited singlet oxygen atom O(1D) reactions with acetylene

Chao Yan, Cheyenne Teng, Timothy Chen, Aric Rousso, Gerard Wysocki, Yiguang Ju

Research output: Contribution to conferencePaperpeer-review

Abstract

The present work studies the branching ratio and rate constants of important reactions for the O(1D) + C2H2 kinetic pathways in a Herriott cell photolysis flow reactor. Mid-infrared tunable diode laser absorption spectroscopy (TDLAS) and Faraday rotation spectroscopy (FRS) are utilized for quantitative in situ measurements of OH, HO2, and O3. The branching ratios of reactions O(1D) + C2H2 → C2H2O (1a), O(1D) + C2H2 → HCCO + H (1b) and O(1D) + C2H2 → CH2 + CO (1c) are fitted to the experimental data. Time dependent OH radical concentration suggests the branching ratio of channel 1a, 1b and 1c are 56%, 22% and 22%, respectively. The results show that low temperature C2H2 oxidation can be greatly improved by adding two key elementary reactions: C2H2+ OH → C2H2OH and C2H2OH + O2 → C2H2O + HO2. The rate constants for the reaction C2H2OH + O2 → C2H2O + HO2 is found to be kC2H2OH+O2 = 1 × 1012 cm3 mole-1 s-1 (at 296 K and 60 Torr). The present experimental results demonstrate the potential of current setup for more accurate chemical kinetics study in both low-temperature combustion and plasma-assisted combustion.

Original languageEnglish (US)
StatePublished - 2018
Event2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018 - State College, United States
Duration: Mar 4 2018Mar 7 2018

Other

Other2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018
CountryUnited States
CityState College
Period3/4/183/7/18

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Chemical Engineering(all)

Keywords

  • Faraday rotation spectroscopy
  • Photolysis flow reactor
  • Reaction kinetics
  • Singlet oxygen atom

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