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

摘要

Granules based on silicon dioxide and having the properties: Average particle size: 10 to 120 mu m BET surface area: 40 to 400 m2/g Pore volume: 0.5 to 2.5 ml/g Pore size distribution: less than 5% of the total pore volume exists of pores with a diameter<5 nm, remainder are meso- and macropores pH value: 3.6 to 8.5 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.