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Benzene formation in premixed fuel-rich 1,3-butadiene flames

Journal Article · · Proceedings of the Combustion Institute
Detailed kinetic modeling and flame-sampling molecular-beam time-of-flight mass spectrometry are combined to unravel important pathways leading to the formation of benzene in a premixed laminar low-pressure 1,3-butadiene flame. The chemical kinetic model developed is compared with new experimental results obtained for a rich (phi = 1.8) 1,3-butudiene/O(2)/Ar flame at 30 Torr and with flame data for a similar but richer (phi = 2.4) flame reported by Cole et al. [Combust. Flame 56 (1) (1984) 51-70]. The newer experiment utilizes photoionization by tunable vacuum-ultraviolet synchrotron radiation, which allows for the identification and separation of combustion species by their characteristic ionization energies. Predictions of mole fractions as a function of distance from the burner of major combustion intermediates and products are in overall satisfactory agreement with experimentally observed profiles. The accurate predictions of the propargyl radical and benzene mole fractions permit an assessment of potential benzene formation pathways. The results indicate that C(6)H(6) is formed mainly by the C(3)H(3) + C(3)H(3) and i-C(4)H(5) + C(2)H(2) reactions, which are roughly of equal importance. Smaller contributions arise from C(3)H(3) + C(3)H(5). However, given the experimental and modeling uncertainties, other pathways cannot be ruled out.
Research Organization:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Organization:
USDOE IG Office of Audit Services (IG-30)
DOE Contract Number:
FG02-01ER15180
OSTI ID:
1060548
Report Number(s):
DOE-ER15180-15
Journal Information:
Proceedings of the Combustion Institute, Journal Name: Proceedings of the Combustion Institute Journal Issue: 1 Vol. 32; ISSN 1540-7489
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

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