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 conferencePaper

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 - Jan 1 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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    Yan, C., Teng, C., Chen, T., Rousso, A., Wysocki, G., & Ju, Y. (2018). The kinetic study of excited singlet oxygen atom O(1D) reactions with acetylene. Paper presented at 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018, State College, United States.