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High temperature determination of the rate coefficient for the reaction H 2 O + CN → HCN + OH
Author(s) -
Szekely Attila,
Hanson Ronald K.,
Bowman Craig T.
Publication year - 1984
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.550161214
Subject(s) - chemistry , extrapolation , attenuation coefficient , analytical chemistry (journal) , atmospheric temperature range , temperature coefficient , shock tube , molar absorptivity , range (aeronautics) , absorption (acoustics) , shock wave , thermodynamics , optics , materials science , mathematical analysis , physics , mathematics , chromatography , composite material
The rate coefficient, k , of the reaction\documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm H}_2 {\rm O} + {\rm CN} \to {\rm HCN} + {\rm OH} $$\end{document}has been determined in the temperature range 2460–2840 K using a shock tube technique. C 2 N 2 H 2 OAr mixtures were heated behind incident shock waves and the CN and OH concentration time histories were monitored simultaneously using broad‐band absorption near 388 nm (CN) and narrow‐line laser absorption at 306.67 nm (OH). The rate coefficient expression providing the best fit to the data was\documentclass{article}\pagestyle{empty}\begin{document}$$ k = 2.3{\rm} \times {\rm 10}^{{\rm 13}} \exp (- 6700/T){\rm cm}^3 /{\rm mol s} $$\end{document}with uncertainty limits of about ±45% in the temperature range 2460–2840 K. The rate coefficient of the reverse reaction was calculated using detailed balancing, and its extrapolation to lower temperatures was compared with previously published results.