Kinetics of reaction of low concentration mixtures of oxides of nitrogen, ammonia and water vapour

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Abstract
The kinetics of reaction between oxides of nitrogen, ammonia, water vapour and oxygen in ppm quantities in nitrogen were studied. The kinetics of the nitrogen dioxide‐ammonia reaction and of the nitrogen dioxide‐water reaction were investigated separately, and a reaction model was developed to predict the rate of disappearance of nitrogen dioxide in the overall reaction system based on the reaction rate expressions deduced for the separate reactions. There was satisfactory agreement between measured and predicted dioxide concentrations as a function of time. The results have relevance to consideration of clean‐up processes of tail gases in nitric acid plants and to studies of reactions in polluted atmospheres.