Integrated LNT-TWC catalyst

US9981258B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Wen-Mei Xue
• Attilio Siani · Shanghai, CN
• John K. Hochmuth · Bound Brook, US
• Markus Kinne · Hannover, DE
• Stefan Kielbassa · Hannover, DE

Key dates

• Filing date: Jul 21, 2017
• Grant date: May 29, 2018
• Expiry date: Jul 21, 2037

Classification

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

Abstract

A layered catalyst composite for the treatment of exhaust gas emissions, effective to provide lean NOx trap functionality and three-way conversion functionality is described. Layered catalyst composites can comprise catalytic material on a substrate, the catalytic material comprising at least two layers. The first layer comprising rare earth oxide-high surface area refractory metal oxide particles, an alkaline earth metal supported on the rare earth oxide-high surface area refractory metal oxide particles, and at least one first platinum group metal component supported on the rare earth oxide-high surface area refractory metal oxide particles. The second layer comprising a second platinum group metal component supported on a first oxygen storage component (OSC) and/or a first refractory metal oxide support and, optionally, a third platinum group metal supported on a second refractory metal oxide support or a second oxygen storage component.