Cerium oxide powder and cerium oxide dispersion

US7553465B2 · kind B2 · utility

Assignee

• Degussa AG · DE

Inventors

• Stipan Katusic · Bad Soden, DE
• Michael Kroell · Gelnhausen, DE
• Michael Kraemer · Nidderau, DE
• Stefan Heberer · Gelnhausen, DE
• Edwin Staab · Geiselbach, DE
• Guenther Michael · Karlstein, DE

Key dates

• Filing date: Aug 11, 2006
• Grant date: Jun 30, 2009
• Expiry date: Jun 19, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2982
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Cerium oxide powder having carbonate groups and made of crystalline primary particles containing cerium oxide and having carbonate groups on the surface and in a region close to the surface, and having a BET surface area of from 25 to 150 m2/g, a mean diameter of from 5 to 50 nm, a carbonate concentration in the region close to the surface decreasing inwardly from the surface, a carbon content due to carbonate groups on the surface of from 5 to 50% by area, a carbon content due to carbonate groups at a depth of about 5 nm in a region close to the surface of from 0 to 30% by area, a content of cerium oxide calculated as CeO2 and based on the powder of at least 99.5% by weight and a content of organic and inorganic carbon of from 0.01 to 0.3% by weight. A dispersion containing this powder.