Multilayered catalyst compositions

US7922988B2 · kind B2 · utility

Inventors

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

Key dates

• Filing date: Oct 30, 2009
• Grant date: Apr 12, 2011
• Expiry date: Oct 30, 2029

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. The catalytic material can be provided in layers such that a larger amount of oxygen storage component is provided in a downstream zone as compared to an upstream zone. For example, the upstream zone can be configured to have one, two, or three layers, and the downstream zone can be independently configured to have one, two, or three layers. 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.