Catalytic article for treating exhaust gas

US9545602B2 · kind B2 · utility

Assignee

• Johnson Matthey Public Limited Company · GB

Inventors

• Olivier Sonntag · Stuttgart, DE
• Tim Genschow · Royston, GB
• Gudmund Smedler · Bleket, SE
• Andrew Peter Walker · Royston, GB
• Mikael Larsson · Mölndal, SE
• Penelope Markatou · Wayne, US
• Lingzhi Zhang · Lansdale, US
• Jane Gast · Spring City, US

Key dates

• Filing date: May 15, 2015
• Grant date: Jan 17, 2017
• Expiry date: Jun 3, 2035

Classification

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

Abstract

Provided is a catalytic article comprising (a) a flow through honeycomb substrate having channel walls; (b) a first NH3-SCR catalyst composition coated on and/or within the channel walls in a first zone; and (c) a second NH3-SCR catalyst composition coated on and/or within the channel walls in a second zone, provided that the first zone is upstream of the second zone and the first and second zones are adjacent or at least partially overlap; and wherein the first NH3-SCR catalyst comprises a first copper loaded molecular sieve having a copper to aluminum atomic ratio of about 0.1 to 0.375 and the second NH3-SCR catalyst comprises a second copper loaded molecular sieve having a copper-to-aluminum atomic ratio of about 0.3 to about 0.6.