Granules based on pyrogenically prepared silicon dioxide, methods for their preparation and use thereof

US5776240A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Klaus Deller · Großkrotzenburg, DE
• Helmfried Krause · Rodenbach, DE
• Juergen Meyer · Taunusstein, DE
• Dieter Kerner · Midland Park, US
• Hans Lansink-Rotgerink · Goldbach, DE
• Werner Hartmann · Hamburg, DE

Key dates

• Filing date: Feb 5, 1996
• Grant date: Jul 7, 1998
• Expiry date: Feb 5, 2016

Classification

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

Abstract

Granules based on silicon dioxide and having the properties: PA1 Average particle size: 10 to 120 .mu.m PA1 BET surface area: 40 to 400 m.sup.2 /g PA1 Pore volume: 0.5 to 2.5 ml/g PA1 Pore size distribution: less than 5% of the total pore volume exists of pores with a diameter<5 nm, remainder are meso- and macropores PA1 pH value: 3.6 to 8.5 PA1 Tapped density: 220 to 700 g/l They are prepared by dispersing silicon dioxide in water, spray drying, and optionally heating and/or silanizing. The granules can be used as catalyst supports.