CATALYST AND PROCESS FOR OLIGOMERIZING OLEFINS

摘要

A catalyst, which is active in the oligomerization of olefins is an X-ray-amorphous silica-alumina-nickel oxide gel having an SiO2/Al2O3 molar ratio of from 30/1 to 500/1, an NiO/SiO2 molar ratio of from 0.001/1 to 0.01/1, a superficial area of from 500 m<2>/g to 1.000 m<2>/g, and a porosity of from 0.3 ml/g to 0.6 ml/g, the mean pore diameter being 1 nm (10 Angstrom), and devoid of pores having a diameter over 3 nm (30 Angstrom). The catalyst selectively dimerizes isobutene into alpha- and beta-isobutene and oligomerizes propylene into its relative dimers and trimers. A process is described for preparing the silica-alumina-nickel oxide gel.