Abstract
A kinetic model has been developed for the combustion of trichloroethylene (TCE) under low Cl/H ratio conditions. Flame species concentration profiles, measured for CH 4/O 2/Ar flames, reveal that the most important reaction channels in the decomposition of TCE in the CH 4/TCE/O 2/Ar flame are the displacement by H atoms of Cl atoms from TCE, 1,1-dichloroethylene (DCE), and vinyl chloride. The displacement of Cl atoms from TCE by OH also contributes to the decomposition of TCE, and leads to the production of 2,2-dichloroethenol, a species unobserved in previous flame studies. Other species found in large concentrations in the present CH 4/TCE/O 2/Ar flames, but not observed in previous TCE/O 2/Ar flame studies at higher chlorine-to-hydrogen ratios, are ketene, chloroketene, and dichloroketene. Finally, the presence of TCE catalyzes the formation of C 3–C 6 hydrocarbons. The presence of significant concentrations of C 3H 3, C 3H 4, and C 6H 6 is consistent with “odd carbon species” mechanisms previously suggested for benzene formation in hydrocarbon flames.
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