NOx Abatement in Diesels: Process Analysis, Optimisation and Impact (NADiP)

Scope of project

The selective catalytic reduction of NOx with urea is one of the key technologies for nitrous oxide abatement in the field of heavy-duty vehicles and naval engines. The project NADIP focuses on increasing the efficiency of urea selective catalytic reduction (SCR) DeNOx systems by optimization of the urea decomposition upstream the SCR catalyst. Crucial parameters studied and optimized within this project are fluid dynamic behaviour of the urea-water solution as well as urea thermolysis and hydrolysis under formation of ammonia. The underlying thermolysis and hydrolysis reaction mechanisms will be studied on a model reaction system employing surface science analysis tools. Based on model simulations the fluid dynamic behaviour will be optimized on an exhaust gas test flow rig. The improved SCR system will be implemented into a heavy-duty diesel engine and a naval engine exhaust gas line to verify its increased efficiency. The impact of widespread introduction of the improved technology on the atmosphere and resulting future air quality will be simulated.


Dr. Panayotis Dimopoulos Eggenschwiler, Empa
Telephone: +41 44 823 4337