The overall rate coefficient and the branching ratio of the NH2 + NO2 reaction were determined in shock tube experiments. Benzylamine (C6H5CH2NH2) was used as a thermal source of the NH2 radical. To obtain the overall rate coefficient, the NH2 mole fraction was measured using frequency-modulation absorption spectroscopy. For the branching ratio determination, the IR emission from N2O was monitored. During the N2O emission experiments, the NO2 mole fraction was measured simultaneously using a tunable diode laser. The measured species profiles were interpreted using a detailed 118-reaction mechanism, which was based on the reaction mechanism from our previous study of the NH2 + NO reaction with added reactions involving N2O and NO2. The overall rate coefficient is (5.5 ± 0.8) × 1012 cm3 mol-1 s1 in the temperature range, 1330-1527 K, and pressure range 1.31-1.49 bar. This value is 1.6 times the result of Glarborg et al. and 2.5 times that extrapolated from the expression reported by Park and Lin. The measured branching ratio for the N2O+ H2O product channel of the NH2+NO2 reaction was 0.17 ± 0.04 for the temperature range 1319-1493 K, which is consistent with the results of Park and Lin and Quandt and Hershberger at lower temperatures.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Mechanical Engineering
- Physical and Theoretical Chemistry