Device and procedure for the production of ammonia

US7678352B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Norbert Breuer · Ditzingen, DE
• Stefan Woerz · Lambach, DE
• Andreas Genssle · Musberg, DE
• Peter Riegger · Stuttgart, DE
• Franz-Josef Trompeter · Aachen, DE
• Thomas Hauber · Aalen, DE
• Markus Hernier · Gerlingen, DE
• Ralf Wegst · Gaggenau, DE
• Thorsten Raatz · Schwieberdingen, DE

Key dates

• Filing date: Nov 20, 2006
• Grant date: Mar 16, 2010
• Expiry date: Apr 23, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Devices and methods for the production of ammonia as a reducing agent for the selective catalytic reduction (SCR) of nitrogen oxides in the exhaust gas of a combustion source, especially of an internal combustion engine. The ammonia is admixed with the exhaust gas in the direction of flow in front of a SCR-catalytic converter. In so doing, nitrogen oxide is produced in a nitrogen oxide production unit separated from the combustion source and its exhaust gas duct and is stored in at least one storage catalytic converter or a nitrogen oxide storage and a subsequently connected catalytic converter. Furthermore, hydrogen and/or a hydrogen-carbon monoxide-mixture is produced in a hydrogen production unit separated from the combustion source and its exhaust gas duct and delivered to a storage catalytic converter. Hydrogen and the stored nitrogen oxide are converted catalytically to ammonia in the storage catalytic converter or in the catalytic converter.