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A modeling study of benzene formation was performed in five low-pressure, rich, laminar premixed flames with acetylene, ethylene, propene, benzene and heptane as fuels. Three published detailed reaction mechanisms were tested against molecular beam mass spectrometry (MBMS) species profiles for each flame. Differences between the three mechanisms were explored with emphasis put on benzene and acetylene profiles. It results from this study that the C3H3 path plays a major role in benzene formation whereas the C4 route is negligible. Better results obtained with Kyne's mechanism can be explained by the reversibility of the C3H3 + C3H3 = C6H6 reaction.