Silica-particles containing alumina, process for preparing same and use thereof.

摘要

Amorphous, substantially spherical silica particles obtained by acidic hydrolysis of substantially spheri­cal synthetic crystalline calcium silicates having a size of from 20 to 120 microns are coated with a layer comprising silica and alumina. The silica particles obtained may be directly employed as catalysts for the oligomerization of olefins and, having been loaded with platinum, as hydrocracking catalysts.