Granulate auf Basis von pyrogen hergestelltem Siliziumdioxid, Verfahren zu ihrer Herstellung und ihre Verwendung

摘要

Granules based on pyrogenically prepared silicon dioxide with the following physico-chemical characteristic data: Average particle diameter: 10 to 120 &mgr;m BET surface area: 40 to 400 m<2>/g Pore volume: 0.5 to 2.5 ml/g Pore distribution: content of pores of pore diameter < 5 nm in the total pore volume of less than 5%, remainder meso- and macropores Tamped density: 220 to 1,000 g/l Numerical content of particles in the particle size range above the D10 value of the particle size distribution weighted according to volume which have tucks or closed off inner hollow spaces: < 35 % They are prepared by a procedure in which silicon dioxide is dispersed in a liquid, preferably water, together with one or more auxiliaries, the dispersion is spray dried and the granules are optionally heat-treated and/or silanized. The granules are employed as a catalyst support.