Reactions of H-atoms with C₃H₄-isomers

Propargyl radicals (C₃H₃) are important precursors for the formation of aromatics in combustion and pyrolysis processes. No direct experimental studies on the reaction of H atoms with propyne under high-temperature conditions have been reported. Thus, experiments were performed behind shock waves at 1200-1400 K and 1.3-4 bar of argon. Total rate coefficients for the H + propyne reaction were determined as a function of temperature. They were, within the experimental uncertainties, pressure-independent and agreed with the results of a TST calculation that accounts only the reaction route leading to C₂H₂ and CH₃. This might indicate that this reaction channel is dominant under the experimental conditions. The influence of the propyne-allene isomerization was negligible. This is an abstract of a paper presented at the 30th International Symposium on Combustion (Chicago, IL 7/25-30/2004).