Process for preparing an amorphous silica-alumina composition and relative amorphous silica-alumina composition

摘要

The present invention relates to a process for preparing an amorphous silica-alumina composition, comprising the following operative phases: a) mixing an aqueous solution comprising a silicon compound and an aqueous solution comprising an aluminium compound, in the presence of a gelification initiator comprising alumina hydrate having the general formula Al2O3·nH2O, wherein n varies from 1 to 3, and obtaining a silica-alumina sol, b) adding a base precipitating agent to said silica-alumina sol and co-precipitating a silica-alumina composition. The present invention also relates to an amorphous silica-alumina composition which can be obtained with the above process. The amorphous silica-alumina composition of the invention is extremely homogeneous, has a high total pore volume and has acid properties analogous to those of zeolite materials. The amorphous silica-alumina composition of the invention can be advantageously used as catalyst or catalyst carrier in hydrocarbon conversion reactions and in other industrial processes.