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Issue 45, 2011
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High-temperature oxidation chemistry of n-butanol – experiments in low-pressure premixed flames and detailed kinetic modeling

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Abstract

An automated reaction mechanism generator is used to develop a predictive, comprehensive reaction mechanism for the high-temperature oxidation chemistry of n-butanol. This new kinetic model is an advancement of an earlier model, which had been extensively tested against earlier experimental data (Harper et al., Combust. Flame, 2011, 158, 16–41). In this study, the model’s predictive capabilities are improved by targeting isomer-resolved quantitative mole fraction profiles of flame species in low-pressure flames. To this end, a total of three burner-stabilized premixed flames are isomer-selectively analyzed by flame-sampling molecular-beam time-of-flight mass spectrometry using photoionization by tunable vacuum-ultraviolet synchrotron radiation. For most species, the newly developed chemical kinetic model is capable of accurately reproducing the experimental trends in these flames. The results clearly indicate that n-butanol is mainly consumed by H-atom abstraction with H, O, and OH, forming predominantly the α-C4H9O radical (CH3CH2CH2˙CHOH). Fission of C–C bonds in n-butanol is only predicted to be significant in a similar, but hotter flame studied by Oßwald et al. (Combust. Flame, 2011, 158, 2–15). The water-elimination reaction to 1-butene is found to be of no importance under the premixed conditions studied here. The initially formed isomeric C4H9O radicals are predicted to further oxidize by reacting with H and O2 or to decompose to smaller fragments via β-scission. Enols are detected experimentally, with their importance being overpredicted by the model.

Graphical abstract: High-temperature oxidation chemistry of n-butanol – experiments in low-pressure premixed flames and detailed kinetic modeling

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Publication details

The article was received on 24 May 2011, accepted on 15 Sep 2011 and first published on 12 Oct 2011


Article type: Paper
DOI: 10.1039/C1CP21663E
Citation: Phys. Chem. Chem. Phys., 2011,13, 20262-20274
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    High-temperature oxidation chemistry of n-butanol – experiments in low-pressure premixed flames and detailed kinetic modeling

    N. Hansen, M. R. Harper and W. H. Green, Phys. Chem. Chem. Phys., 2011, 13, 20262
    DOI: 10.1039/C1CP21663E

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