Abstract
Nitrous oxide (N2O) emission from urea SCR vehicles is invstigated by both engine and vehicles tests. Emission level of N2O in JE05 test cycle is 0.36 to 0.43g/kWh, that is equivalent for 15-20% of global warming effect for CO2 emission. From test results of the engine without post DOC, 80% or more of N2O is formed by oxidization of NH3. N2O emission from urea SCR may increase, if SCR catalyst is deteriorated and NH3 adsorption capacity decrease, or if NOx reduction techniques such as rising catalyst temperature to meet '09 emission regulation are installed.
