H2EAdyn - Hydrogen Engine Exhaust Aftertreatment - Dynamic AddOn

Internal combustion engines powered by hydrogen (H2-IC) are one way to realize a CO2-free energy economy. Particularly as vehicle drives, they are cost-effective and robust, offering long range and short refuelling times. One disadvantage is that nitrogen oxides (NOx) are emitted. The use of high-performance exhaust gas aftertreatment (EA) can reduce these emissions to harmless levels. The consortium is convinced that this will enable a competitive overall system to be realized. In the still ongoing H2EA project, it was demonstrated that the SCR and oxidation catalyst systems, main solution in the diesel sector, can achieve comparable or even better results on H2 ICs. However, it was also observed that the presence of hydrogen has a more significant effect on the various reactions than previously assumed. This may have a major impact especially on the subsequent system architecture of the EA. The investigations in the H2EA were mainly based on steady-state measurements and generic load steps. The contents of the H2EAdyn project, which is designed as a direct extension of the H2EA, focus mainly on the fully transient operation of the H2 engine and the EA. The project is only made possible by the fact that a method for the fully transient operation of a quality-controlled H2 engine was developed at the consortium leader in early 2022. This method is available to the H2EAdyn project. The method allows cold-started, legal emission cycles to be measured on the engine test bed. This is a significant step in the advancement of EA for H2 VKM. The fundamental results of H2EA represent an ideal prerequisite for this. The focus is on cold start, thermal management and EA architecture, SCR systems and oxidation catalyst. The choice of coatings will be extended compared to H2EA. Especially at cold temperatures, further fundamental insights into the influence of H2 on the known reactions in AGN are expected. Of particular interest are the secondary emissions N2O and NH3.