Flame Structure Studies of Cf3br-inhibited Methane Flames. 3. The Effect of 1% Cf3br on Composition, Rate Constants and Net Reaction Rates.
Biordi-JC; Lazzara-CP; Papp-JF
J Phys Chem 81(12):1139-1145
Molecular beam-mass spectrometry was used to determine the complete microstructure of a 10.1% Ch4-21.2% O2-67.6% Ar-1.1% Cf3br flame and its inhibited analogue, both stabilized at 32 torr on a cooled flat flame burner. Composition and temperature profiles for the inhibited flame are shown. Comparison of clean and inhibited flames shows more pronounced inhibition effects with 1.1% Cf3br than previously observed. These effects include, for the flame containing 1.1% Cf3br, a shift of the primary reaction zone to high temperature, a higher final flame temperature (quenched flames), a reduction in maximum h2co concentration, and a reduction in the concentrations of h, o, and oh at low temperature. Comparison of flames containing 1.1% and 0.3% Cf3br initially shows the net reaction rate of the inhibitor also shifted to higher temperature in the former. Cf3br is judged to decay by thermal decomposition as well as by abstraction reactions.
J. Phys. Chem., V. 81, No. 12, PP. 1139-1145