Ignition of a syngas/air mixture intensified by an electrical discharge in air: Experiment and modelling

Reaction of the N Atom with Electronically Excited O2 Revisited: A Theoretical Study

“…Meanwhile, for a number of problems and issues, such as reacting gas flow behind the strong shock wave and in the expanding nozzle, ,− atmospheric chemistry, − electric discharge chemistry, − plasma chemistry and plasma processing, , laser-induced and plasma-aided combustion, ,,− are associated with appreciable electronic excitation of the gaseous air components. At the same time, it is known that electronic excitation can substantially alter molecular properties, especially, reactivity, ,− as a result of which the use of nonequilibrium O 2 (air) discharge plasma containing highly reactive electronically excited molecules [essentially, O 2 (a 1 Δ g ) and N 2 ( A 3 Σ u + )] can promote ignition and combustion of various fuel/O 2 (air) mixtures. ,,− …”

“…However, apart from some preliminary studies, ,, it is still unclear how such stimulation of fuel oxidation can affect the associated formation of nitrogen oxides (although there are certain prerequisites for reducing NO x emission in this case ,, ), especially since the kinetics of NO x formation in the presence of electronically excited species is very complex, ,,, while the role of excited molecules ,,, and intermediates , in NO x chemistry can be decisive.…”

“…At the same time, it is known that electronic excitation can substantially alter molecular properties, especially, reactivity, 45,74−77 as a result of which the use of nonequilibrium O 2 (air) discharge plasma containing highly reactive electronically excited molecules [essentially, O 2 (a 1 Δ g ) and N 2 (A 3 Σ u + )] can promote ignition and combustion of various fuel/O 2 (air) mixtures. 45,60,77−82 However, apart from some preliminary studies, 44,82,83 it is still unclear how such stimulation of fuel oxidation can affect the associated formation of nitrogen oxides (although there are certain prerequisites for reducing NO x emission in this case 44,63,84 ), especially since the kinetics of NO x formation in the presence of electronically excited species is very complex, 56,60,66,85 while the role of excited molecules 61,63,82,86 and intermediates 87,88 in NO x chemistry can be decisive.…”