Researchers at the University of Sheffield are working on a four-year project funded by an EPSRC grant to develop new exhaust aftertreatment systems for heavy-duty engines running on clean, zero-carbon fuels like ammonia. Led by Professor Bill Nimmo and PhD student Madhumitha Rajendran, the project aims to address the challenges of decarbonizing heavy vehicles used in various sectors. The research focuses on ammonia as a clean fuel due to its minimal environmental impact when combusted, with nitrogen and water as the primary byproducts. Although NOx gases can be produced during ammonia combustion, it is still considered a viable energy source with existing global infrastructure for production and transportation. The project involves two main research phases: dual fuel combustion modeling and post-combustion treatment. The modeling work using 'Ansys Chemkin-Pro' aims to assess engine efficiency and emissions profiles by adjusting various parameters. The subsequent phase will evaluate the NOx reduction efficiencies of commercial catalysts under different conditions. The research laboratory in Sheffield is equipped with a controlled temperature furnace reactor for catalyst studies, while partners at Brunel University will conduct related work on a diesel engine test bed. Gas analysis will be carried out using a Signal Group analyser rack to measure various exhaust gas components. Initial results suggest that using ammonia dual fuel could increase N2O emissions under certain conditions, but also show potential benefits for reducing NOx. The project seeks to advance sustainable transportation solutions by overcoming challenges associated with ammonia fuel combustion.