Kinetic modelling of catalytic N₂O removal

With decarbonisation of the marine industry, the use of hydrogen-based fuels such as ammonia introduces a need for development of the emission aftertreatment systems, for internal combustion engines. The main components are NO, NO₂ and N₂O formed in the combustion process, as well as ammonia that passes through the engine unburned. These products, alongside the altered emission profiles, pose a significant challenge for the emission aftertreatment, with the focus placed mainly on the development of the SCR system. Modelling of the catalytic removal of N₂O from the exhaust gas was done as this component has the largest relative environmental impact of all the emissions from ammonia combustion. The studies have been aimed at gaining understanding of the factors that impact formation and removal of N₂O in the aftertreatment system. Modelling of the experimental data has been done using a mechanistic model based on the surface reactions. The model was validated using the test data from catalyst screening in lab reactors.