Quantitative Measurements of HO 2 and Other Products of n -Butane Oxidation (H 2 O 2 , H 2 O, CH 2 O, and C 2 H 4 ) at Elevated Temperatures by Direct Coupling of a Jet-Stirred Reactor with Sampling Nozzle and Cavity Ring-Down Spectroscopy (cw-CRDS)

Mokhtar Djehiche 1 Ngoc Linh Le Tan 1 Chaithanya Jain 1 Guillaume Dayma 1 Philippe Dagaut 1 Christian Chauveau 1 Laure Pillier 1 Alexandre Tomas 2
1 ICARE - Institut de Combustion, Aérothermique, Réactivité et Environnement
2 Mines Douai EMD - École des Mines de Douai
Abstract : For the first time quantitative measurements of the hydroperoxyl radical (HO2) in a jet-stirred reactor were performed thanks to a new experimental setup involving fast sampling and near-infrared cavity ring-down spectroscopy at low pressure. The experiments were performed at atmospheric pressure and over a range of temperatures (550−900 K) with n-butane, the simplest hydrocarbon fuel exhibiting cool flame oxidation chemistry which represents a key process for the auto-ignition in internal combustion engines. The same technique was also used to measure H2O2, H2O, CH2O, and C2H4 under the same conditions. This new setup brings new scientific horizons for characterizing complex reactive systems at elevated temperatures. Measuring HO2 formation from hydrocarbon oxidation is extremely important in determining the propensity of a fuel to follow chain-termination pathways from R + O2 compared to chain branching (leading to OH), helping to constrain and better validate detailed chemical kinetics models.
Keywords : Butane HO2 RADICALS Hydrogen peroxide H2O2 Cavity ring-down spectroscopy Jet-stirred reactor kinetic modeling
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Journal articles
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https://hal.archives-ouvertes.fr/hal-01858509
Contributor : Christian Chauveau <>
Submitted on : Monday, August 20, 2018 - 6:50:16 PM
Last modification on : Wednesday, December 18, 2019 - 5:21:21 PM

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CNRS | INSTITUT-TELECOM | UNIV-ORLEANS | IMT-LILLE-DOUAI | CNRS_ICARE

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Mokhtar Djehiche, Ngoc Linh Le Tan, Chaithanya Jain, Guillaume Dayma, Philippe Dagaut, et al.. Quantitative Measurements of HO 2 and Other Products of n -Butane Oxidation (H 2 O 2 , H 2 O, CH 2 O, and C 2 H 4 ) at Elevated Temperatures by Direct Coupling of a Jet-Stirred Reactor with Sampling Nozzle and Cavity Ring-Down Spectroscopy (cw-CRDS). Journal of the American Chemical Society, American Chemical Society, 2014, 136 (47), pp.16689 - 16694. ⟨10.1021/ja510719k⟩. ⟨hal-01858509⟩

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