Optimized process for the production of catalyst supports based on silica gel as well as chromium catalysts supported on silica gel

摘要

The invention relates to a catalyst support and a method for the production of said catalyst support comprising: a) production of a 10 to 25 weight % solid (calculated as SiO2) containing silicic acid-hydro gels whose particles are essentially sphere-shaped; b) extraction of the hydrogel-particles using alcohol until at least 60 % of the water contained in the hydrogel is removed, c) drying the hydrogel so obtained, at a temperature of /= 160 DEG C at normal pressure and subsequent treatment of said hydrogel with an inert carrier gas until the remaining alcohol content is less than 10 weight % (xerogel-formation); d) adjustment of said xerogel particle size so obtained to the desired particle size, whereby the hydrogel particle have a particle size of /= 8 mm prior to extraction. The invention also relates to a catalyst and a method for the production ofsaid catalyst by loading the catalyst support with chromium compounds. The invention further relates to a method for the production of polyolefins using said catalyst.