Method and device for selective catalytic NOx reduction
AssigneeRobert Bosch GmbH
InventorsArmin Marko, Thomas Wahl, Ulrich Alkemade, Frank Brenner, Marc Bareis, Horst Harndorf
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Abstract
In a method and device for selective catalytic NOx reduction in oxygen-containing exhaust gases using ammonia and a reduction catalyst, gaseous ammonia is made available by heating a solid storage medium in a container. The method and device are suitable for use in motor vehicles in particular.
Claims19
A method for providing a selective catalytic NOx reduction in an oxygen-containing exhaust gas of an engine by using a gaseous ammonia and a reduction catalyzer, the method comprising the steps of:
- introducing a solid storage medium into a container, the solid storage medium storing ammonia;
- heating the solid storage medium to provide the gaseous ammonia;
- charging a quantity of the gaseous ammonia into the exhaust gas to provide a charged ammonia quantity;
- and
- adapting the charged ammonia quantity to an actual operating condition of the engine via a control device.
A device for providing a selective catalytic NOx reduction in an oxygen-containing exhaust gas of an engine by using a gaseous ammonia and a reduction catalyzer, the device comprising:
- a supply line adapted to supply the gaseous ammonia into an exhaust line between the engine and the reduction catalyzer;
- a container for containing a solid storage medium, the solid storage medium storing ammonia;
- a valve arrangement for coupling the supply line to the container;
- a heating device for heating the container;
- and
- a control device for adapting a quantity of gaseous ammonia conveyed to the exhaust line via a charging arrangement to an actual operating condition of the engine.
Dependencies are inferred from the claim text.