Diesel oxidation catalyst with layered structure containing ceria composition as palladium support material for enhanced HC and CO gas conversion

US9044734B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Gerd Grubert · Hannover, DE
• Torsten Neubauer · Langenhagen, DE
• Alfred Punke · Walle, DE
• Marcus Hilgendorff · Hannover, DE
• Torsten W. Müller-Stach · Hannover, DE
• Olga Gerlach · Ludwigshafen, DE
• Xinyi Wei · Princeton, US
• Jeffrey B. Hoke · New Brunswick, US
• Shiang Sung · New York, US
• Stanley Roth · Yardley, US

Key dates

• Filing date: Sep 21, 2012
• Grant date: Jun 2, 2015
• Expiry date: Nov 21, 2032

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2523/00
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to a layered diesel oxidation catalyst (DOC) comprising: a) a carrier substrate; b) a diesel oxidation catalytic material comprising b1) a first layer located on the carrier substrate, the first layer comprising palladium impregnated on a support material comprising ceria in an amount of at least 45 weight-% based on the total weight of the support material, and optionally comprising platinum; b2) a second layer located on the first layer, the second layer comprising palladium and platinum each impregnated on a support material comprising a metal oxide; wherein the platinum to palladium weight ratio of the first layer is lower than the platinum to palladium weight ratio of the second layer.