Patent · US Active

Three way conversion catalyst with alumina-free rhodium layer

US8617496B2 · kind B2 · utility

29Cited by

3References

23Claims

0Family size

Assignee

BASF SE

Inventors

Junmei Wei · Iselin, US
Attilio Siani · Shanghai, CN
Mirko Arnold · Bedminster, US
Stefan Kotrel · Bedminster, US
Stephan Siemund · Pattensen, DE
Knut Wassermann · Princeton, US

Key dates

Filing date	Jan 13, 2012
Grant date	Dec 31, 2013
Priority date	—
Expiry date	Apr 18, 2032

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/12
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Provided are exhaust systems and components suitable for use in conjunction with gasoline engines to treat gaseous emissions such as hydrocarbons, nitrogen oxides, and carbon monoxides. Layered three-way conversion (TWC) catalysts comprise an outer layer whose rhodium is supported by an oxygen storage component, such as a ceria-zirconia composite, and the outer layer is substantially free from alumina as a support. The rhodium-containing layer can be free of all other precious metals, such as platinum and palladium. A lower palladium layer is provided where the palladium is supported by a refractory metal oxide. The lower palladium layer can be free of rhodium and platinum and can contain an oxygen storage component that is the same or different from that in the rhodium-containing layer. Methods of making and using these catalysts are also provided.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.