Method of preparing a double layered, palladium-only...

Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide

Reexamination Certificate

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C502S302000, C502S303000, C502S325000, C502S326000, C502S339000, C423S213500

Reexamination Certificate

active

07407911

ABSTRACT:
The present invention relates to a method of preparing a double layered, palladium-only three-way catalyst using three different composite oxides. More particularly, the present invention relates to a method of preparing a double layered, palladium-only three-way catalyst comprising a first coating layer (bottom layer) and a second coating layer (top layer) containing palladium by incorporating composite oxide, praseodymium oxide, and perovskite.

REFERENCES:
patent: 6043188 (2000-03-01), Yeo
patent: 6294140 (2001-09-01), Mussmann et al.
patent: 2004/0223897 (2004-11-01), Yeo
patent: 2001-079404 (2001-03-01), None
patent: 2001079404 (2001-03-01), None
patent: 00235029 (1999-09-01), None

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