期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 32, 期 -, 页码 647-655出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2008.05.025
关键词
Sooting premixed laminar flame; Ethylbenzene; PAHs; MBMS; Tunable synchrotron VUV photoionization
资金
- Chinese Academy of Sciences
- Natural Science Foundation of China [20533040]
- National Basic Research Program of China (973) [2007CB815204]
- Ministry of Science and Technology of China [2007DFA61310]
A slightly sooting premixed ethylbenzene flame with an equivalence ratio of 1.90 was investigated at low pressure (4.0 kPa) using molecular-beam mass spectrometry (MBMS) and tunable synchrotron vacuum ultraviolet (VUV) photoionization. Basing on the ionization threshold measurements of photoionization efficiency (PIE) spectra, combustion intermediates up to C19H12 were identified, including a number of radicals and isomeric species. Mole fraction profiles of observed flame species were evaluated from the measurements of burner scan at the photon energies near ionization thresholds. Besides, the flame temperature profile was measured by a Pt/Pt-13%Rh thermocouple. From the intermediate identification and mole fraction measurements, the degradation of ethylbenzene, as well as the formation of some interested polycyclic aromatic hydrocarbons (PAHs); was discussed in detail. It is suggested that the formation of most typical PAHs observed in this work can be related to the H-abstraction/C2H2-addition (HACA) mechanism. Furthermore, the high concentration levels of intermediates in this flame is ascribed to the weak C-C bonds in the sidechain of ethylbenzene, which provides a potential explanation of the high sooting tendencies of ethylbenzene and other monocyclic aromatic fuels with complex sidechain structure. This study is anticipated to be constructive for combustion investigations of aromatic fuels, and the discussion is hoped to be helpful for further modeling studies concerning PAHs formation in combustion process. (c) 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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