Research on the High-Efficiency Catalytic Removal Reaction Model of N 2 O in Ammonia Engine Exhaust Gas

The growing use of ammonia-fueled engines has made removing nitrous oxide (N2O) from their exhaust a key research focus, as N2O, a potent greenhouse gas, undermines ammonia’s zero-carbon benefits. This study examines the development and results of a catalytic reaction model for N2O removal, focusing on iron-based catalysts, which show strong activity and stability. Among iron-based catalysts, carriers primarily include Beta and ZSM-5 molecular sieves. Through comparing catalytic efficiencies in standard SCR reactions, Fe/ZSM-5 is selected as the preferred catalyst. Using Chemkin software, a selective catalytic reduction (SCR) reaction kinetics model is built to analyze system chemistry, aiming to widen the active temperature window (200–800℃) and optimize N2O conversion for this catalyst. The model integrates NH3 adsorption/desorption, NH3 conversion, N2O reduction, nitrate decomposition, synergistic NH3-N2O reactions (standard, fast, side reactions), and by-product NOₓ dynamics, with real-time N2O emission monitoring. It investigates how factors influence outcomes. Post-processing combines 1D reaction mechanisms and 3D simulations to map velocity, temperature, pressure, and concentration fields. Comparisons between Fe/ZSM-5 experiments and simulations reveal high consistency, with errors within expected ranges under identical conditions. The model’s predictions provide critical data and reliability analysis for designing and optimizing catalytic reaction systems.