Identification and temporal behavior of radical intermediates formed during the combustion and pyrolysis of gaseous fuels: kinetic pathways to soot formation. Progress report, September 1, 1979-August 31, 1980
A shock tube coupled to a time-of-flight mass spectrometer has been employed to sample mixtures of various fuels (methane, acetylene, propane, cyclohexane, benzene, and toluene) with or without oxygen in order to determine the major kinetic pathways to soot formation. One significant observation has been the product distribution from toluene pyrolysis which consists primarily of compounds and radical intermediates having masses less than that of the parent fuel and containing relatively low amounts of species having masses greater than toluene. The experiment was performed at temperatures and fuel densities where previous laser extinction work reported soot conversion yields of 80 to 90%. Supporting work for our findings is found from Knudsen cell experiments over the temperature range of interest in which the product distribution was recorded mass spectrometrically and from single pulse shock tube experiments which included the analysis of gas after shock heating. These results are important since they question the absolute amounts of soot yield reported by several research groups using the laser extinction technique. However, the relative yields of soot conversion determined by the laser technique from a wide variety of fuels may be correct. Even more important is our result that acetylene is the major product of toluene pyrolysis which argues against the commonly held view that ring condensation steps dominate fragmentation reaction channels.
- Research Organization:
- New Orleans Univ., LA (USA). Dept. of Chemistry
- DOE Contract Number:
- AS05-79ER10505
- OSTI ID:
- 5305824
- Report Number(s):
- DOE/ER/10505-1; CONF-800814-6
- Resource Relation:
- Conference: 180. American Chemical Society meeting/2. chemical congress of the North American Continent, Las Vegas, NV, USA, 24 Aug 1980
- Country of Publication:
- United States
- Language:
- English
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Identification and temporal behavior of radical intermediates formed during the combustion and pyrolysis of gaseous fuels: kinetic pathways to soot formation. Progress report, September 1, 1979-August 31, 1982
Identification and temporal behavior of radical intermediates formed during the combustion and pyrolysis of gaseous fuels: kinetic pathways to soot formation. Progress report, September 1, 1982-June 30, 1983
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
10 SYNTHETIC FUELS
ACETYLENE
COMBUSTION KINETICS
BENZENE
CYCLOHEXANE
METHANE
PROPANE
TOLUENE
MASS SPECTROSCOPY
PYROLYSIS
RADICALS
REACTION INTERMEDIATES
SOOT
YIELDS
ALKANES
ALKYNES
AROMATICS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
CYCLOALKANES
DECOMPOSITION
FLUIDS
HYDROCARBONS
KINETICS
ORGANIC COMPOUNDS
REACTION KINETICS
SPECTROSCOPY
THERMOCHEMICAL PROCESSES
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry
090110 - Hydrocarbon Fuels- Properties- (1979-1989)