PREPARATION OF SPHEROIDAL SILICO-ALUMINA PARTICLES

摘要

A process for preparing spheroidal silica-alumina particles containing alumina in an amount at least equal to that of silica, comprising dispersing as droplets into a hot and practically water-immiscible fluid, an aqueous mixture comprising an alkali silicate, alumina hydrogel, perchloric acid and a water-soluble monomer whose uncrosslinked polymer is water-soluble or forms a gel, alkali silicate and alumina hydrogel being used in proportions corresponding to 0.5 to 50% by weight of SiO2 and 99.5 to 50% by weight of Al2O3, and maintaining the droplets of the mixture in the fluid until a substantial polymerization of the monomer occurs. The beads are useful as catalysts and catalyst supports in polymeric reactions.