A shock tube study of the reaction H[sub 2] + NO [yields] HNO + H

Conference · Thu Dec 01 04:00:00 EST 1994 · Combustion and Flame; (United States)

OSTI ID:6798797

Natarajan, K ^[1]; Mick, H J; Woiki, D; Roth, P ^[2]

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1. Anna Univ., Madras, (India). Dept. of Mechanical Engineering
2. Univ. Duisburg (Germany). Inst. fuer Verbrennung und Gasdynamik

The high-temperature reaction of NO with H[sub 2] has been studied behind reflected shock waves in the temperature range of 1,760--2,160 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[sub 2] highly diluted in argon were used as initial reactants. The rate coefficient, k[sub 1], of the initiation reaction: NO + H[sub 2] [yields] HNO + H has been determined from the measured initial H-atom concentration slopes to be k[sub 1] = 1.5[times]10[sup 13] exp(-26165K/T) cm[sup 3]/mol s, taking the fast decomposition of HNO into account. This direct determination of the rate coefficient k[sub 1] was possible, because the contribution of H[sub 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 H[sub 2]/NO/Ar reaction system (2,560 K [le] T [le] 4,040 K) were sensitive to the reaction NO + H [yields] 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.

• OSTI ID: 6798797
• Report Number(s): CONF-940711--
• Conference Information: Journal Name: Combustion and Flame; (United States) Journal Volume: 99:3-4
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
083000 -- Hydrogen-- Combustion-- (1990-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ABSORPTION SPECTRA
AIR POLLUTION ABATEMENT
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ELEMENTS
HYDROGEN
KINETICS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
REACTION KINETICS
SPECTRA
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K