Exhaust-gas purification catalyst to be used close to the engine and process for its production

US6875725B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Dieter Lindner · Hanau, DE
• Lothar Mussmann · Offenbach, DE
• Martin Votsmeier · Bruchköbel, DE
• Egbert Lox · Hanau, DE
• Thomas Kreuzer · Karben, DE

Key dates

• Filing date: Aug 14, 2001
• Grant date: Apr 5, 2005
• Expiry date: Oct 1, 2022

Classification

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

Abstract

A starter catalyst for the purification of the exhaust gases from internal combustion engines, which include palladium on aluminum oxide and of barium oxide, as well as a process for its production. The barium oxide and palladium are together deposited in a finely divided state on the supporting material aluminum oxide and the average particle size of the palladium crystallites is between 3 and 7 nm. The small crystallite size of palladium and the barium oxide likewise deposited in finely divided state on the supporting material impart to the catalyst a high activity and long-term stability to high temperature stresses.