Kinetics of the Consumption of Cf3h, Cf2hcl and Cf2o in H-2/o-2 Flames

The structure of two premised lean and stoichiometric H-2/O-2/Ar/CF3H flames and of a stoichiometric H-2/O-2/Ar/CF2HCl name has been established using a mass spectrometer coupled with molecular beam sampling. The main goal of this work is to study the first step of the CF3H - and the CF2HCl - consumption by reaction with radicals in flames. The rate coefficients of reactions (1) CF3H + H --> products and (2) CF3H + O --> CF3 + OH have been determined: k(1) = 1.16 10(14) exp(-8800/T) cm(3) mole(-1) s(-1) in the temperature range 960 - 1300 K and k(2) = 1.10 10(12) exp(-1600/T) cm(3) mole(-1) s(-1) in the temperature range 920 - 1150 K. In the lean flame 5% of CF3H is consumed by H. 83% by O and 12% by OH, while in the stoichiometric flame 40% is consumed by H, 42% by O and 18% by OH. The determination of the rate coefficient of the reaction (4) CF2HCl + H --> CF2H + HCl in the CF2HCl containing flame leads to the expression k(4) = 4.65 10(14) exp(-7730/T) cm(3)mole(-1)s(-1) in the temperature range from 930 to 1155 K. The rate coefficient of the reaction (7) CF2O + H --> CFO + HF determined in the burnt gases of the investigated flames is k(7) = 4.50 10(13) exp(-11500/T) cm(3)mole(-1)s(-1) between 1175 and 1190 K