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)

DOI:https://doi.org/10.1021/j100527a004· OSTI ID:7105802

Biordi, J C; Lazzara, C P; Papp, J F

Molecular beam-mass spectrometry has been used to determine the complete microstructure of a 10.1 percent CH/sub 4/-21.2 percent 0/sub 2/-67.6 percent Ar-1.1 percent CF/sub 3/Br flame and its uninhibited analogue, both stabilized at 32 Torr on a cooled flat flame burner. Composition and temperature profiles for the inhibited flame are shown. Kinetic analyses of the profiles yield values for the rate coefficients for the reactions H + CH/sub 4/ ..-->.. H/sub 2/ + CH/sub 3/, H + O/sub 2/ ..-->.. OH + O, CO + OH ..-->.. CO/sub 2/ + H, and CH/sub 3/ + O ..-->.. H/sub 2/CO + H over the temperature ranges 1500 to 1600 and 1725 to 1825 K. Comparison of clean and inhibited flames shows more pronounced ''inhibition'' effects with 1.1 percent CF/sub 3/Br, a shift of the primary reaction zone to high temperature, a higher final flame temperature (quenched flames), a reduction in maximum H/sub 2/CO concentration, and a reduction in the concentrations of H, O, and OH at low temperature. Comparison of flames containing 1.1 and 0.3 percent CF/sub 3/Br initially shows the net reaction rate of the inhibitor also shifted to higher temperature in the former. CF/sub 3/Br is judged to decay by thermal decomposition as well as by abstraction reactions.

• Research Organization: Bureau of Mines, Pittsburgh
• OSTI ID: 7105802
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 81:12; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

090110* -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
ALKANES
BROMINATED ALIPHATIC HYDROCARBONS
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
CONFIGURATION
CRYOGENIC FLUIDS
ELEMENTS
FLAMES
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
INHIBITION
KINETICS
METHANE
NONMETALS
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN
REACTION KINETICS