Selective catalytic reduction wall flow filter incorporating a vanadate

US9987619B2 · kind B2 · utility

Assignee

• Johnson Matthey Public Limited Company · GB

Inventors

• Kaneshalingam Arulraj · Royston, GB
• Ralf Dotzel · Burgkunstadt, DE
• Rainer Leppelt · Lichtenfels, DE
• Jorg Werner Muench · Unterlangenstadt, DE
• Alexandra Tsami Goodwin · Royston, GB
• Gudmund Smedler · Bleket, SE

Key dates

• Filing date: May 31, 2013
• Grant date: Jun 5, 2018
• Expiry date: May 31, 2033

Classification

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

Abstract

A filter incorporates a catalyst for the Selective Catalytic Reduction (SCR) of NOx gases and removal of particulate matter from the exhaust gas of a lean burn combustion engine, wherein the catalyst includes a vanadate component having an alkaline earth metal, a transition metal, a rare earth metal, or combinations thereof. The vanadate component may be iron vanadate. The filter includes a supported vanadate component disposed on a wall-flow filter. The method of making the filter includes applying an aqueous mixture of the supported vanadate component as a washcoat on the wall-flow filter or extruding a composition containing the supported vanadate component. The method of treating exhaust gases from an engine includes contacting the exhaust gas with the catalyst including the vanadate component.