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.