ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Deliberate activation of the reaction vessel surface leads to the domination of chain termination in ethane pyrolysis by the reaction \documentclass{article}\pagestyle{empty}\begin{document}$$ (5) {\rm H} \to \frac{1}{2}{\rm H}_2 $$\end{document}As a result, chains are dramatically reduced in length, methane yields are entirely primary and larger in proportion to other products, and values of k1 \documentclass{article}\pagestyle{empty}\begin{document}$$ (1){\rm C}_2 {\rm H}_6 \to 2{\rm CH}_3 $$\end{document} can be directly determined from methane yield data without ambiguity. Experiments carried out in the temperature range of 841-913K at initial ethane pressures of 1-20 torr, without and with added nitrogen, yield the infinite pressure Arrhenius equation \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm log}k_{\rm 1} ({\rm s}^{ - 1}) = 16.52 \pm 0.44 - 87900 \pm 1760{\rm cal}/{\rm mol}/2.303RT $$\end{document}It is shown that most previously published data can be combined with those of this study to yield \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm log}k_{\rm 1} ({\rm s}^{ - 1}) = 16.63 \pm 0.18 - 88400 \pm 720{\rm cal}/{\rm mol}/2.303RT $$\end{document}Fall-off curves for k1 as a function of pressure are in good agreement with those from other laboratories. From these the relevant data for k-1 can be extracted for use in other kinetic studies.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550150813
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