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In this thesis, a detailed chemical kinetic mechanism is developed to predict the oxidation of ammonia. The main aim is to cover the most important features of ammonia combustion - laminar flame speed, auto-ignition timing, emission formation, speciation in different reactors, and subsequently to study fuel/NOx interaction. Each elementary reaction in the mechanism is carefully reviewed based on several published literature, both experimental and theoretical rate parameters are selected accordingly. A wide range of published experimental data in multi-setup experiments are selected - in freely propagating and burner stabilized premixed flames and in shock tubes and jet-stirred and flow, reactor to assess the performance of the developed mechanism. The reaction mechanism also considers the formation of nitrogen oxides and the reduction of nitrogen oxides depending on the conditions of the surrounding gas phase. The experimental data from the literature are interpreted with the help of the kinetic model developed in this thesis.