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Rate constants for abstraction of hydrogen from ethylene by methyl and ethyl radicals relative to abstraction from propane and isobutane
Author(s) -
Ahonkhai S. I.,
Lin XH.,
Back M. H.
Publication year - 1989
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550210102
Subject(s) - isobutane , chemistry , propane , ethylene , methane , radical , hydrogen atom abstraction , hydrogen , reaction rate constant , abstraction , alkane , photochemistry , hydrocarbon , organic chemistry , kinetics , catalysis , philosophy , physics , epistemology , quantum mechanics
A method is described for the measurement of relative rate constants for abstraction of hydrogen from ethylene at temperatures in the region of 750 K. The method is based on the effect of the addition of small quantities of propane and isobutane on the rates of formation of products in the thermal chain reactions of ethylene. On the assumption that methane and ethane are formed by the following reactions,measurements of the ratio of the rates of formation of methane and ethane in the presence and absence of the additive gave the following results:\documentclass{article}\pagestyle{empty}\begin{document}$$\log (k_7 /k_2) = (- 0.50 \pm 0.4) + (3200 \pm 1000)/2.3T$$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$\log (k_8 /k_3) = (- 0.20 \pm 0.4) + (2800 \pm 1000)/2.3T$$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$\log (k_{11} /k_2) = (- 0.97 \pm 0.4) + (4600 \pm 1000)/2.3T$$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$\log (k_{12} /k_3) = (- 2.0 \pm 0.4) + (6300 \pm 1000)/2.3T$$\end{document}Values for k 2 and k 3 obtained from these ratios are compared with previous measurements.