Formation of N ₂ O in the Exhaust Line of Combustion Engines

With the announcement of the Euro 7 proposal, it is now clear that nitrous oxide (laughing gas, N₂O) emissions must be considered and complied with the certification of exhaust aftertreatment systems (EATS) of commercial vehicles (CV). This paper describes the possible formation pathways for N₂O in the EATS for different drives and uses measurement results to show the boundary condition and the magnitude of formation as well as the possibilities for influencing or preventing its formation.