Chemical flame inhibition using molecular beam mass spectrometry bromotrifluoromethane in low pressure methane--oxygen--argon flames
Technical Report
·
OSTI ID:5311041
A molecular beam-mass spectrometer-low pressure flat flame apparatus has been constructed for the purpose of examining the chemical microstructure of normal methane-oxygen-argon flames and those inhibited with Halon extinguishants. Details of construction and performance of this apparatus and of related flame temperature measurements are given. Particular attention is paid to the empirical characterization of the perturbation to the flame caused by the sampling probes. The composition profiles obtained for normal flames are compared to those of flames inhibited by CF/sub 3/Br. In addition to the usual stable species (CH/sub 4/, O/sub 2/, CO, CO/sub 2/, H/sub 2/O, H/sub 2/, and H/sub 2/CO), the inhibitor, its products and intermediates associated with its reactions could be followed; in particular, hydrogen bromide, bromine atoms, hydrogen fluoride, and carbonyl fluoride were observed. The relatively rapid disappearance of inhibitor and early appearance of fluorinated reaction products suggest a short lifetime for the CF/sub 3/ radical in this system. Observation of COF/sub 2/ suggests that CF/sub 3/Br is effective as an inhibitor, at least in part, by virtue of its interference with the oxygen containing species of the normal chain reaction. Profiles of the 17/sup +/ peak at low electron energy suggests that the hydroxyl radical may also be sampled, but the profiles obtained are not yet sufficiently accurate to determine the effect of inhibitor on this important flame radical.
- Research Organization:
- Bureau of Mines, Washington, D.C. (USA)
- OSTI ID:
- 5311041
- Report Number(s):
- BM-RI-7723
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Molecular beam mass spectrometry applied to determining the kinetics of reactions in flames. II. A critique of rate coefficient determinations. [Low-pressure methane--oxygen--argon flames]
Technical Report
·
Tue Dec 31 23:00:00 EST 1974
·
OSTI ID:7309164
Flame structure studies of CF/sub 3/Br-inhibited methane flames. III. The effect of 1% CF/sub 3/Br on composition, rate constants, and net reaction rates
Journal Article
·
Thu Jun 16 00:00:00 EDT 1977
· J. Phys. Chem.; (United States)
·
OSTI ID:7105802
Molecular beam mass spectrometry applied to determining the kinetics of reactions in flames. II. A critique of rate coefficient determinations. [Low-pressure methane--oxygen--argon flames]
Journal Article
·
Sat Jan 31 23:00:00 EST 1976
· Combust. Flame; (United States)
·
OSTI ID:7192034
Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALKANES
ARGON
BEAMS
CRYOGENIC FLUIDS
ELEMENTS
FLAMES
FLUIDS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
INHIBITION
MASS SPECTROSCOPY
METHANE
MOLECULAR BEAMS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN
RADICALS
RARE GASES
SPECTROSCOPY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALKANES
ARGON
BEAMS
CRYOGENIC FLUIDS
ELEMENTS
FLAMES
FLUIDS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
INHIBITION
MASS SPECTROSCOPY
METHANE
MOLECULAR BEAMS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN
RADICALS
RARE GASES
SPECTROSCOPY