Olefin Chemistry in a Premixed n-Heptane Flame

ion reactions reach their maximum rates, however, in the high-temperature region, where thermal decomposition reactions are also most active. Formation and Consumption of Other Olefins. Despite the model-dependent differences in reactions of heptene isomers, the chemistry of other olefins is very similar for all three mechanisms, especially for larger olefins. Reactions that involve oxygenated compounds of low-temperature chemistry show some importance for the formation of 1-hexene in the LLNL mechanism (HA55) but with a rate that is one order of magnitude lower than that of the competing â-scission reaction (D54). Besides 1-hexene, those reactions that involve oxygenates are Table 2. Formation and Consumption Reactions of Olefin Species formation reactions consumption reactions species typea Tmax max rateb typea Tmax max rateb typea Tmax max rateb typea Tmax max rateb Pitsch Mechanism C6H12 D1 1269 2.74 × 10-5 D2 1269 2.54 × 10-5 HA3 1269 1.83 × 10-6 C4H8 C4 1269 2.19 × 10-5 D5 1372 2.76 × 10-5 AD6 1372 2.18 × 10-6 C3H6 D7 1269 7.08 × 10-5 C8 1372 1.82 × 10-5 A9 1372 5.70 × 10-5 HA1