Catalyst carrier and method for producing same

US5610116A · kind A · utility

Assignee

• HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

• Waltraud Werdecker · Hanau, DE
• Rolf Gerhardt · Hammersbach, DE
• Wolfgang Krock · Niederrodenbach, DE

Key dates

• Filing date: Oct 5, 1994
• Grant date: Mar 11, 1997
• Expiry date: Oct 5, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/0081
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In order to provide a temperature- and acid-resistant catalyst carrier based on a gas-pervious carrier body and a porous surface layer having a high silica content, while dispensing with a washcoat, the carrier body and the surface layer are designed as a chemically and physically homogeneous structure shaped in a single operation. The SiO.sub.2 content amounts to at least 99% by weight and has a specific surface from 5 m.sup.2 /g to 50 m.sup.2 /g. In a process for producing a catalyst carrier made of synthetic, amorphous silica particles with more than 99% by weight SiO.sub.2, a paste is prepared with the particles, a liquid, and a binder. Plastifying agents are added to the paste and the paste is continuously extruded into a monolithic greenware strand. The alkali and alkaline earth content of the paste is set at no more than 200 ppm and the greenware is cut to length and sintered at a temperature in a range between 800.degree. C. and 1400.degree. C.