Quantitative Measurements of HO2 and Other Products of n-Butane Oxidation (H2O2, H2O, CH2O, and C2H4) at Elevated Te

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• 作者：Mokhtar Djehiche ; Ngoc Linh Le Tan ; Chaithanya D. Jain ; Guillaume Dayma ; Philippe Dagaut ; Christian Chauveau ; Laure Pillier ; Alexandre Tomas
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：November 26, 2014
• 年：2014
• 卷：136
• 期：47
• 页码：16689-16694
• 全文大小：482K
• ISSN：1520-5126

文摘

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鈥?00 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.