The role of N2O and NNH in the formation of NO via HCN in hydrocarbon flames

Effect of steam addition on flame structure and NO formation in H2–O2–N2 diffusion flame

“…Figure 7(b) also shows that the reaction steps of (R49) and (R62) becomes relatively important for highly diluted flame and thereby low flame temperature. This is consistent with the results that have stressed the importance of the mechanisms of NNH and N 2 O especially al low flame temperatures (Konnov et al, 2001;Tomeczek and Gradon, 2003).…”

“…Rrtveit et al (2002) discussed differences between the influences of the various diluents in terms of differences in heat capacities, thermal-radiative properties, and effects on chemical reactions. Tomeczek and Gradon (2003) proposed a new way of forming HCN via N 2 O and NNH reacting CH i radicals, and recognized that the new mechanism was more probable than Fenimore's direct reaction of N 2 with CH i radicals. Konnov et al (2001) showed from the evaluation of the NNH route that this pathway was important at short residence times.…”

The NOx and N2O Emission Characteristics of an HCCI Engine Operated With n-Heptane

“…Traditionally, it is believed that NO x is formed mainly through three mechanisms denoted as the thermal, prompt, and N 2 O-intermediate mechanisms [8][9][10]. Although there is also growing evidence of a fourth mechanism involving NNH [10,11], it will not be reviewed in this paper.…”

Unimolecular and Bimolecular Calculations for HN2

“…[1][2][3][4][5][6] It is also relevant in the understanding of noncatalytic radical mechanisms leading to the ammonia production. 7 Although the experimental detection of HN 2 is still to be accomplished (see ref 8), a long-standing conclusion from theoretical methods based on ab initio calculations is that such a species should be metastable with a very short lifetime.…”