Ethanol flame structure investigated by molecular beam mass spectrometry |
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Authors: | TS Kasper K Kohse-Höinghaus |
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Affiliation: | Physikalische Chemie I, Universität Bielefeld, Universitätsstraße 25, 33615 Bielefeld, Germany |
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Abstract: | The oxidation of ethanol was studied in low-pressure, premixed flat flames using molecular beam mass spectrometry (MBMS) in combination with electron impact ionization (EI) and resonance-enhanced multiphoton ionization (REMPI). Flame temperature profiles were measured by laser-induced fluorescence (LIF) of seeded NO. Two ethanol/oxygen/argon flames with stoichiometries of ?=1.00 and ?=2.57 were investigated at 50 mbar by EI-MBMS. Profiles of a variety of stable and radical species were measured as a function of height above the burner. The benzene profile in the fuel-rich ethanol flame was obtained by REMPI-MBMS. The same technique was used to determine the dependence of the benzene concentration on the ethanol/propene ratio in low-pressure flames with blended fuels (propene/ethanol/oxygen/argon). The C/O ratio of all blends was kept constant at C/O=0.773 or C/O=0.600. Ethanol addition ranged from 0 to 15% for flames with C/O=0.773, and from 0 to 100% for flames with C/O=0.600. In both data sets, a decrease of the benzene concentration with increasing ethanol percentage was observed. Qualitative information on some other aromatic species with higher mass was also obtained. |
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Keywords: | Molecular beam mass spectrometry Electron impact ionization Resonance-enhanced multiphoton ionization Laser-induced fluorescence Thermometry Ethanol Propene Doped flames Combustion Oxidation |
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