Catalytic reduction of NOx

US9302224B2 · kind B2 · utility

Assignees

• Daimler AG · DE
• HJS EMISSION TECHNOLOGY GMBH & CO. KG · DE
• Johnson Matthey Public Limited Company · GB

Inventors

• Anders Andreasson · Kungsängen, SE
• Guy Richard Chandler · Cambridge, GB
• Claus Friedrich Goersmann · Maidstone, GB
• James Patrick Warren · Cambridge, GB
• Georg Huthwohl · Soest, DE

Key dates

• Filing date: Sep 17, 2014
• Grant date: Apr 5, 2016
• Expiry date: Sep 17, 2034

Classification

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

Abstract

A system for NOx reduction in combustion gases, especially from diesel engines, incorporates an oxidation catalyst to convert at least a portion of NO to NO2, particulate filter, a source of reductant such as NH3 and an SCR catalyst and methods for operating such a system are disclosed. Considerable improvements in NOx conversion and soot reduction are observed even at relatively low operating temperatures.