Abstract
Measurements have been made of H and D concentrations in dilute mixtures of C/sub 2/H/sub 6/ and C/sub 2/D/sub 6/, shock-heated to temperatures of 1240 to 1700 K at 2 to 3 atm pressure. In the range 1240 to 1500 K the product k/sub 1/k/sub 2/ has been measured, where reaction 1 is C/sub 2/H/sub 6/ ..-->.. 2CH/sub 3/ d reaction 2 is CH/sub 3/ + C/sub 2/H/sub 6/ ..-->.. CH/sub 4/ + C/sub 2/H/sub 5/. When literature values of k/sub 2/ were used, k/sub 1/ was found to be 2.8 x 10/sup 15/ exp(-84240 cal/RT) s/sup -1/. This expression can be correlated well with other literature data on the reaction via a RRKM/energy transfer model. Between 1500 and 1700 K interpretation of the data requires a reaction which forms H atom from methyl radicals, which we take to be CH/sub 3/ + CH/sub 3/ ..-->.. C/sub 2/H/sub 5/ + H ..-->.. C/sub 2/H/sub 4/ + 2H, with a rate constant at 1700 K of 1.5 x 10/sup 11/ mol/sup -1/ cm/sup 3/ s/sup -1/.
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