The formation of aromatic carbon in sooting ethylene flames
Book
·
OSTI ID:93217
- CNR, Napoli (Italy). Istituto Ricerche Combustione
The concentration profiles of soot, acetylene, diacetylene, benzene and condensed species were measured inside a slightly sooting (C/O = 0.64) and a sooting (C/O = 0.78) premised ethylene flame at atmospheric pressure. Condensed species (CS) were analyzed by gas chromatography and mass spectrometry, identifying and quantifying polycyclic aromatic hydrocarbons (PAH) with molecular mass up to 400 u. PAH species with masses in the range between 400 and 1,000 u were not detected, even when isolating the heaviest fractions of the condensed species by solvent solubility and liquid chromatography techniques. The sum of PAH quantified by gas chromatography and mass spectrometry did not totally justify the CS weight, and a spectroscopic characterization of the CS (uv-visible, fluorescence, and infrared spectroscopy) was attempted. The spectroscopic behavior of the CS shows that a low degree of ring condensation and/or a certain degree of aliphatic functionality has to be supposed in the unidentified high molecular mass fraction of the condensed species. The aromatic carbon, mostly represented by benzene and CS, showed the maximum concentration early in both the flames, at the onset of soot formation but, differently from the slightly sooting flame, a fast reincrease of CS and benzene was found in the burned gas region of the sooting flame. Moreover, the consumption of CS in the region of soot inception was faster in the sooting flame where oxygen is less available for their oxidation, thus the decrease in their concentration was not only due to oxidation, but also to the participation of these species in soot inception.
- OSTI ID:
- 93217
- Report Number(s):
- CONF-940711--
- Country of Publication:
- United States
- Language:
- English
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