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The thermal decomposition of propene behind reflected shock waves with 1200 < Ts < 1800 K and 1.6 X mol/cm3 was studied by IR laser kinetic absorption spectroscopy and gas-chromatographic analysis of reaction products. The present data together with earlier shock tube data were satisfactorily modeled with a 51-reaction mechanism. As the initial step of the reaction, three channels, C3H6 = CH3 + CzH3 (11, C3H6 = H + AC3H5 (2), and C3H6 = CH, + CzHz (3), were necessary to interpret all the experimental data. 0 1992 JohnWiley & Sons, Inc.

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The pyrolysis of 2% CHI and 5% CHI diluted with Ar was studied using both a single-pulse and time-resolved spectroscopic methods over the temperature range 1400-2200 K and pressure range 2.3-3.7 atm. The rate constant expressions for dissociative recombination reactions of methyl radicals, CH, + CH3 + C2H, + H and CH, + CH3 + C2H4 + Ha, and for C,H4 formation reaction were investigated. The simulation results required considerably lower value than that reported for CH3 + CH, -+ C2H4 + H2. Propyne formation was interpreted well by reaction C2H, + CH, -+ p-C,H, + H with k = 6.2 x 10'' exp(-17 kcal/RT) cm3 mol-' s-'.