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High temperature study of the reactions of O and OH with NH3

✍ Scribed by S. Salimian; R. K. Hanson; C. H. Kruger

Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
664 KB
Volume
16
Category
Article
ISSN
0538-8066

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✦ Synopsis

Mixtures of NH, and N,O dilute in Ar were heated behind incident shock waves in the temperature range 1750-2060 K. A cw ring dye laser, tuned to the center of an OH absorption line in the ultraviolet, was used to monitor OH concentration profiles by absorption spectroscopy. Infrared emission was used to follow N,O (at 4.5 pm) and NH, (at 10.5 pm) concentration-time histories. The early-time NH, and OH concentration profiles were sensitive to the rate constants of the reactions (2) NHB + O + N H , + O H and (3) leading to the following best-fit expressions for k, and k,:k, = lo', 34r0 exp( -4470/T) and k3 = exp(-4230/T) cm3 mol-' s -' . The results of this study combined with previous low-temperature data suggest a significant non-Arrhenius behavior for both k, and k3.

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