A highly active Ag/alumina catalytic converter for continuous HC-SCR during lean-burn conditions:: from laboratory to full-scale vehicle tests

A common-rail diesel vehicle was equipped with a full-scale Ag/alumina catalytic converter. The converter consisted of several Ag/alumina bricks, with free space in between each brick to fulfil important gas phase reactions. An oxidation catalyst was placed at the end of the converter to remove formed CO and unburned HC. High conversion levels of NOx, around 60%, were recorded at several speeds and loads using additional HC (diesel) injection corresponding to 2-5% fuel penalty.