Kinetics of the Thermal Decomposition of C2F6 in the Presence of H2 at 1300°—1600°K

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Abstract
The thermal decomposition of hexafluoroethane in the presence of hydrogen has been studied in a single-pulse shock tube in the temperature range 1300° to 1600°K. The reactants were highly diluted with argon, the composition ratios being Ar:H2:C2F6≃7500:17.4:1. The principal reaction products containing carbon were fluoroform and tetrafluoroethylene. A reaction scheme which accounts for these products is proposed and the first-order rate constant for the primary step C2F6→2CF3 is deduced: k1=4.3×1017 exp(−94 400±4000)/RT sec−1. Accepting an activation energy of about 1 kcal/mole for the recombination of CF3 radicals leads to D(CF3–CF3)≃93±4 kcal/mole.