A shock tube study of the product branching ratio of the NH2 + NO reaction at high temperatures

Soonho Song; Ronald K. Hanson; Craig T. Bowman; David M. Golden

doi:10.1021/jp020943d

A shock tube study of the product branching ratio of the NH₂ + NO reaction at high temperatures

Soonho Song, Ronald K. Hanson, Craig T. Bowman, David M. Golden

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

The product branching ratio of NH₂ + NO → NNH + OH and NH₂ + NO → N₂ + H₂O has been determined in the temperature range 1826-2159 K in a shock tube study. The pressure range behind reflected shock waves was 1.10 to 1.21 bar. The time history of the NH₂ radical was measured using a frequency modulation absorption technique. The initial gas mixture compositions were 8-28 ppm monomethylamine (CH₃NH₂), 0.4-1.2% ammonia (NH₃), and 0.4% NO, and the balance Ar. According to sensitivity analysis using a detailed 125-reaction mechanism, the NH₂ profiles are mainly sensitive to the branching ratio α = k_1a/(k_1a + k_1b) under the experimental conditions of this study, and they exhibit only a small sensitivity to secondary reactions and the overall rate coefficient, k₁ = k_1a + k_1b. The branching ratio increases from 0.59 ± 0.02 at 1826 K to 0.66 ± 0.04 at 2159 K. These results are consistent with our earlier measurements of the branching ratio at lower temperature and agree with the theoretical result of Miller and Klippenstein.

Original language	English
Pages (from-to)	9233-9235
Number of pages	3
Journal	Journal of Physical Chemistry A
Volume	106
Issue number	40
DOIs	https://doi.org/10.1021/jp020943d
Publication status	Published - 2002 Oct 10

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry

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10.1021/jp020943d

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title = "A shock tube study of the product branching ratio of the NH2 + NO reaction at high temperatures",

abstract = "The product branching ratio of NH2 + NO → NNH + OH and NH2 + NO → N2 + H2O has been determined in the temperature range 1826-2159 K in a shock tube study. The pressure range behind reflected shock waves was 1.10 to 1.21 bar. The time history of the NH2 radical was measured using a frequency modulation absorption technique. The initial gas mixture compositions were 8-28 ppm monomethylamine (CH3NH2), 0.4-1.2% ammonia (NH3), and 0.4% NO, and the balance Ar. According to sensitivity analysis using a detailed 125-reaction mechanism, the NH2 profiles are mainly sensitive to the branching ratio α = k1a/(k1a + k1b) under the experimental conditions of this study, and they exhibit only a small sensitivity to secondary reactions and the overall rate coefficient, k1 = k1a + k1b. The branching ratio increases from 0.59 ± 0.02 at 1826 K to 0.66 ± 0.04 at 2159 K. These results are consistent with our earlier measurements of the branching ratio at lower temperature and agree with the theoretical result of Miller and Klippenstein.",

author = "Soonho Song and Hanson, {Ronald K.} and Bowman, {Craig T.} and Golden, {David M.}",

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AU - Song, Soonho

AU - Hanson, Ronald K.

AU - Bowman, Craig T.

AU - Golden, David M.

PY - 2002/10/10

Y1 - 2002/10/10

N2 - The product branching ratio of NH2 + NO → NNH + OH and NH2 + NO → N2 + H2O has been determined in the temperature range 1826-2159 K in a shock tube study. The pressure range behind reflected shock waves was 1.10 to 1.21 bar. The time history of the NH2 radical was measured using a frequency modulation absorption technique. The initial gas mixture compositions were 8-28 ppm monomethylamine (CH3NH2), 0.4-1.2% ammonia (NH3), and 0.4% NO, and the balance Ar. According to sensitivity analysis using a detailed 125-reaction mechanism, the NH2 profiles are mainly sensitive to the branching ratio α = k1a/(k1a + k1b) under the experimental conditions of this study, and they exhibit only a small sensitivity to secondary reactions and the overall rate coefficient, k1 = k1a + k1b. The branching ratio increases from 0.59 ± 0.02 at 1826 K to 0.66 ± 0.04 at 2159 K. These results are consistent with our earlier measurements of the branching ratio at lower temperature and agree with the theoretical result of Miller and Klippenstein.

AB - The product branching ratio of NH2 + NO → NNH + OH and NH2 + NO → N2 + H2O has been determined in the temperature range 1826-2159 K in a shock tube study. The pressure range behind reflected shock waves was 1.10 to 1.21 bar. The time history of the NH2 radical was measured using a frequency modulation absorption technique. The initial gas mixture compositions were 8-28 ppm monomethylamine (CH3NH2), 0.4-1.2% ammonia (NH3), and 0.4% NO, and the balance Ar. According to sensitivity analysis using a detailed 125-reaction mechanism, the NH2 profiles are mainly sensitive to the branching ratio α = k1a/(k1a + k1b) under the experimental conditions of this study, and they exhibit only a small sensitivity to secondary reactions and the overall rate coefficient, k1 = k1a + k1b. The branching ratio increases from 0.59 ± 0.02 at 1826 K to 0.66 ± 0.04 at 2159 K. These results are consistent with our earlier measurements of the branching ratio at lower temperature and agree with the theoretical result of Miller and Klippenstein.

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A shock tube study of the product branching ratio of the NH₂ + NO reaction at high temperatures

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