Oxygen storage material based on cerium oxide, a process for its preparation and its use

US7238639B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

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

Key dates

• Filing date: Aug 17, 2001
• Grant date: Jul 3, 2007
• Expiry date: Aug 17, 2021

Classification

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

Abstract

An oxygen storage material based on cerium oxide with at least one other oxide of the metals silicon and zirconium, wherein the cerium oxide and the other oxides are present in the form of a mixed oxide. The material is obtainable in that hydroxidic precursors of the mixed oxide are first prepared in a manner known per se using a wet-chemical route, these precursors are optionally dried at temperatures between 80 and 300° C. and the dried precursors are then treated under a hydrogen-containing atmosphere at a temperature between 600 and 900° C. for a period of 1 to 10 hours. The reductive thermal treatment endows the material with a greatly improved dynamic behavior as compared with conventional calcination in air.