Catalytic reduction of NOx

US8043590B2 · kind B2 · utility

Assignees

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

Inventors

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

Key dates

• Filing date: Feb 27, 2009
• Grant date: Oct 25, 2011
• Expiry date: Feb 27, 2029

Classification

• Technology area (CPC —): General

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, a particulate filter, a source of reductant such as NH3 and an SCR catalyst. Considerable improvements in NOx conversion are observed.