Effects of B20 Fuel and Catalyst Entrance Section Length on the Performance of UREA SCR in a Light-Duty Diesel Engine

The current study focused on the effects B20 fuel (20% soybean-based biodiesel) and SCR entrance shapes on a light-duty, high-speed, 2.8L common-rail 4-cylinder diesel engine, at different exhaust temperatures. The results indicate that B20 has less deNO_X efficiency at low temperature than ULSD, and that N₂O emission need to be characterized as well as NH₃ slip. If a mixer and enough mixing length are used, longer divergence section does not improve the deNO_X efficiency significantly under the speed ranges tested.