Multilayered catalyst compositions

US7622096B2 · kind B2 · utility

Assignee

• BASF CATALYSTS LLC · US

Inventors

• Michel Deeba · East Brunswick Township, US
• Knut Wassermann · Princeton, US
• Glenn Svoboda · Readington, US
• Harold Rabinowitz · Upper Montclair, US
• Stephan Slemund · Pattensen, DE
• Xinyi Wei · Princeton, US

Key dates

• Filing date: Aug 9, 2007
• Grant date: Nov 24, 2009
• Expiry date: Dec 28, 2027

Classification

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

Abstract

A layered three-way conversion catalyst having the capability of simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides is disclosed. Engine exhaust treatment system and methods of using the same are also provided. In one or more embodiments, the catalyst supported on a carrier has three layers, where at least two of the layers are zoned to have an oxygen storage component being present in an upstream zone in an amount that is less than the oxygen storage component present in the downstream zone.