Detailed rate coefficients and the enthalpy change of the equilibrium reaction OH+C2H4MHOC2H 4 over the temperature range 544-673 K

Wei-Guang Diau*, Yuan-Pern Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

The reaction between OH and C2H4 in He has been studied over the pressure range 278-616 Torr and the temperature range 544-673 K by means of the laser-photolysis/laser-induced-fluorescence technique. Analysis of the temporal profile of [OH] yielded the equilibrium constant for the reaction OH + C2H4 + M⇌HOC2H4 + M. The temperature dependence of the equilibrium constant led to the enthalpy of reaction ΔH = -(30.3 ± 0.8) kcal mol-1 and the entropy of reaction ΔS = -(30.9 ± 1.0) cal K-1 mol -1 near 600 K, in agreement with previous predictions. Analysis of the detailed rate coefficients suggests that the H-atom abstraction reaction is relatively unimportant in the temperature range of our study; the rate coefficient determined previously for the H-atom abstraction near 673 K may have been overestimated. The temperature dependence of the rate coefficients for the forward, the reverse, and the adduct-loss reactions have been determined to be kf = (4±3)×10-13 exp[(1200±800)/T] cm3 molecule-1 s-1, kr = (6.2±1.0)×1011 exp[ - (11 900±400)/T] s -1, and ka = (8.8-1.5 +25) ×109 exp[ - (10 400-400 +1600)/T] s -1, respectively.

Original languageEnglish
Pages (from-to)377-386
Number of pages10
JournalThe Journal of chemical physics
Volume96
Issue number1
DOIs
StatePublished - 1 Jan 1992

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