Double-layer three-way catalyst with improved aging stability

US10413886B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Joel Despres · Rodenbach, DE
• Joerg-Michael Richter · Scheinfeld, DE
• Martin Roesch · Rodgau, DE
• Nicole Schichtel · Rockenberg, DE
• Marcus Schmidt · Maumee, US
• Jan Schoenhaber · Darmstadt, DE
• Stephanie Spiess · Darmstadt, DE
• Anke Wolf · Rio de Janeiro, BR

Key dates

• Filing date: Jan 15, 2016
• Grant date: Sep 17, 2019
• Expiry date: Jan 15, 2036

Classification

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

Abstract

The present invention relates to a catalyst comprising two layers on an inert catalyst carrier, wherein a layer A lying directly on the catalyst carrier contains at least one platinum group metal and one cerium/zirconium/SE mixed oxide, and a layer B, applied on layer A and in direct contact with the flow of exhaust gas, contains at least one platinum group metal and a cerium/zirconium/SE mixed oxide, wherein SE stands for a rare earth metal other than from cerium, characterized in that the fraction of SE oxide in the cerium/zirconium/SE mixed oxide of layer A is less than the fraction of SE oxide in the cerium/zirconium/SE mixed oxide of layer B.