HIGH-TEMPERATURE PYROLYSIS OF METHANE IN SHOCK-WAVES - RATES FOR DISSOCIATIVE RECOMBINATION REACTIONS OF METHYL RADICALS AND FOR PROPYNE FORMATION REACTION

The pyrolysis of 2% CH4 and 5% CH4 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, CH3 + CH3 → C2H5 + H and CH3 + CH3 → C2H4 + H2, and for C3H4 formation reaction were investigated. The simulation results required considerably lower value than that reported for CH3 + CH3 → C2H4 + H2. Propyne formation was interpreted well by reaction C2H2 + CH3 → P‐C3H4 + H with 𝓀 = 6.2 × 1012 exp(−17 kcal/RT) cm3 mol−1 s−1. Copyright © 1990 John Wiley & Sons, Inc.