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Kinetics studies of the reactions of NCO radicals with NO and O2 in the temperature range between 294 and 1260 K

✍ Scribed by B. Atakan; J. Wolfrum

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 440 KB
Volume: 178
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(91)87050-l

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✦ Synopsis

Absolute rate coefikients for the reaction of NC0 radicals with NO were measured in the temperature range between 294 and 1260 K and the pressure range between 6 and 170 Torr in a heatable quartz reactor by means of the laser photolysis/laser-induced fluorescence technique. NC0 radicals were produced in the fast reaction of CN radicals with Oz. CN was generated by 193 nm photolysis of cyanogen. A curved Arrhenius plot ofthe rate constant was found with a negative temperature dependence. The data were fitted to the expression k,(T) =(3.0~0.4)X10'7T~~'~~'~o'~exp[ (-26Ok30) K/T] cm3 mol-' s-'. No pressure dependence was found between 6 and 73 Torr. An upper limit of the rate constant for the reaction of NC0 radicals with O1 was measured to be 3x lo9 cm3 mol-' s-' at 1260 K_

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