NH2 Reactions in Complex Systems

Nitrogen in combustion is of significant technological interest due to NO formation and destruction. The impact of nitrogen compounds emitted from combustion sources on the environment has motivated an extensive research activity in this field. Mechanisms and models for nitrogen combustion are given in [1]. 

Ammonia-oxygen flames have been extensively studied during the last twenty-five years [1 to 13]. The NH2 radical is an essential component in these flames. The following scheme outlines the important role of NH2 [14]  

The reaction 0 + NH3- NH2 + 0H is too slow at the flame temperature encountered under most conditions. The competition between the reactions of NH2 with NO and H or OH determines whether N2 or NO is the final product. During the combustion of NH3 and N2H4 with oxygen, the main products are N2, H2O, H2, and NO as well as N2O [15]. The main N-containing final product is N2. The amount of NO decreases when the equivalence ratio increases [2]. 

Fuel-Oxygen Flames Doped with Nitrogen-Containing Fuel 

The nitrogen chemistry in hydrocarbon flames with N-containing fuel added has been extensively studied, mainly to explain the NO formation and destruction in these systems [1, 9, 16 to 27]. The general scheme for fuel-oxygen flames is 

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