Monoclinic zirconium dioxide having a large surface area

US6034029A · kind A · utility

Assignee

• BASF SE

Inventors

• Joachim Wulff-Doring · Bischofswerda, DE
• Wolfram Stichert · Heidelberg, DE
• Ferdi Schueth · Mülheim an der Ruhr, DE

Key dates

• Filing date: Dec 17, 1997
• Grant date: Mar 7, 2000
• Expiry date: Dec 17, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Zirconium dioxide which is monoclinic to at least 80% by weight and has a BET surface area of at least 100 m.sup.2 /g is prepared by admixing aqueous zirconium salt solutions with ammonia, drying and calcining the precipitation product, aging the precipitation product, prior to drying, in aqueous phase at from 0 to 300.degree. C. and carrying out the calcination at from 200 to 600.degree. C.