Three way catalyst

US8663588B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Dieter Lindner · Hanau, DE
• Martin Roesch · Rodgau, DE
• Raoul Klingmann · Alzenau, DE
• Anke Wolf · Rio de Janeiro, BR
• Joerg-Michael Richter · Scheinfeld, DE

Key dates

• Filing date: Jun 27, 2007
• Grant date: Mar 4, 2014
• Expiry date: Nov 12, 2029

Classification

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

Abstract

A double-layer three-way catalyst for purification of the exhaust gases from internal combustion engines which has excellent activity and thermal stability is described. The catalyst contains active aluminum oxide and a first cerium/zirconium mixed oxide which are both catalytically activated with palladium in the first layer applied to a catalyst support. In the second layer which is in direct contact with the exhaust gas, the catalyst likewise contains an active aluminum oxide and a second cerium/zirconium mixed oxide which are both catalytically activated with rhodium. The second cerium/zirconium mixed oxide has a higher zirconium oxide content than the first mixed oxide.