✦ LIBER ✦

A shock tube study of the reaction H2 + NO → HNO + H

✍ Scribed by K. Natarajan; H.J. Mick; D. Woiki; P. Roth

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 482 KB
Volume: 99
Category: Article
ISSN: 0010-2180
DOI: 10.1016/0010-2180(94)90054-x

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✦ Synopsis

The high-temperature reaction of NO with H 2 has been studied behind reflected shock waves in the temperature range of 1760-2160 K at total pressures of 1.4 to 2.0 bar by monitoring the time-dependent H-atom concentrations in the postshock reaction zone using atomic resonance absorption spectroscopy (ARAS). Mixtures of NO and H 2 highly diluted in argon were used as initial reactants. The rate coefficient, k 1, of the initiation reaction: NO + H 2 ---, HNO + H has been determined from the measured initial H-atom concentration slopes to be kl = 1.5 × 1013exp(-26165K/T) cm 3 mol -~ s -1, taking the fast decomposition of HNO into account. This direct determination of the rate coefficient k~ was possible, because the contribution of H 2 dissociation to the total H atom concentration of the system was relatively small in the temperature and concentration ranges of this study. Measured O-atom concentrations in the high-temperature H2/NO/Ar reaction system (2560 K < T < 4040 K) were sensitive to the reaction NO + H ~ OH + N, resulting in an estimate of its rate coefficient. A simplified mechanism of 15 elementary reactions was able to predict all measured H and O atom profiles with reasonable accuracy.

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