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 language | English (US) |
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State | Published - 2018 |
Event | 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018 - State College, United States Duration: Mar 4 2018 → Mar 7 2018 |
Other
Other | 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018 |
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Country/Territory | United States |
City | State College |
Period | 3/4/18 → 3/7/18 |
All Science Journal Classification (ASJC) codes
- Mechanical Engineering
- Physical and Theoretical Chemistry
- General Chemical Engineering
Keywords
- Faraday rotation spectroscopy
- Photolysis flow reactor
- Reaction kinetics
- Singlet oxygen atom