Mixed oxide materials for the selective catalytic reduction of nitrogen oxides in exhaust gases

US8617497B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Katja Adelmann · Darmstadt, DE
• Gerald Jeske · Neuberg, DE
• Rainer Domesle · Alzenau, DE
• Nicola Soeger · Nidderau, DE
• Michael Seyler · Rodenbach, DE
• Anke Schuler · Niedernberg, DE
• Thomas R. Pauly · Lansing, US
• Barry W. L. Southward · Catoosa, US

Key dates

• Filing date: Apr 16, 2011
• Grant date: Dec 31, 2013
• Expiry date: Apr 16, 2031

Classification

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

Abstract

The invention relates to the use of mixed oxides made of cerium oxide, zirconium oxide, rare earth sesquioxide and niobium oxide as catalytically active materials for the selective catalytic reduction of nitrogen oxides with ammonia or a compound that can decompose to form ammonia in the exhaust gas of internal combustion engines in motor vehicles that are predominantly leanly operated, and to compositions or catalysts which contain said mixed oxides in combination with zeolite compounds and/or zeolite-like compounds and are suitable for the denitrogenation of lean motor vehicle exhaust gases in all essential operating states.