✦ LIBER ✦

A shock tube study of the reactions of CH with CO2 and O2

✍ Scribed by Michael W. Markus; Paul Roth; Thomas Just

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 574 KB
Volume: 28
Category: Article
ISSN: 0538-8066
DOI: 10.1002/(sici)1097-4601(1996)28:3<171::aid-kin3>3.0.co;2-s

No coin nor oath required. For personal study only.

✦ Synopsis

The formation and consumption of CH radicals during shock-induced pyrolysis of a few ppm ethane diluted in argon was measured by a ring-dye laser spectrometer Absorption-overtime profiles, measured at a resonance line in the Q-branch of the A2A -X211 band of C H at A = 431.1311 nm. were recorded and transformed into CH concentrations by known absorption coefficients. By adding some hundred ppm of C 0 2 or 0 2 to the initial mixtures, the CH concentration profiles were significantly perturbed Both the perturbed and unperturbed CH concentration profiles have been compared with calculations based on a reaction kinetic model A sensitivity analysis revealed that the perturbation process was dominated by direct reactions of CH with the added molecules. By fitting calculated to observed C H profiles the following rate coefficients were obtained CH + C O z a products CH + 0 2 % products kco? = 1.9 X lOI4 exp(-7950 KIT) cm3 mo1-l s-' ko, = 7.5 X lOI3 cm3 mol-l s-I

The experiments were performed in the temperature range between 2500 K and 3500 K

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