Reaction of ethyl radicals with hydrogen and deuterium

Abstract
Studies of the relative yields of C2H6 produced in the oxidation of propionaldehyde at 440°C in the presence and absence of H2 or D2 have enabled the velocity constant ratios k3/k14 and k5/k14 to be determined: C2H5+ C2H5CHO = C2H6+ C2H5CO (14) C2H5+ H2= C2H6+ H (5) C2H5+ D2= C2H5D + D (3) From the known values of k14, absolute values of k3 and k5 were obtained. By combining these values at 440°C with other values at lower temperatures, the best values for the velocity constants are k3= 4.07 × 109 exp (–14,700/RT), k5= 6.46 × 109 exp (–14,100/RT), in l. mole–1 sec–1 units.

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