Methods of preparation of an olefin oligomerization catalyst

摘要

A method of making a catalyst for use in oligomerizing an olefin, the catalyst comprising a chromium-containing compound, a pyrrole-containing compound, a non-halide metal alkyl, a metal halide-containing compound, and optionally a solvent, the method comprising contacting a composition comprising at least a portion of the non-halide metal alkyl with a composition comprising the chromium-containing compound to form a mixture and subsequently contacting the mixture with one or more remaining catalyst components.