Copolymerization of ethylene with 1-hexene over vanadium catalysts immobilized on sol-gel silica

摘要

Silica-type materials with different structure and morphology,synthesized using sol-gel process,were applied as a carriers of organometallic catalytic systems (VOCl3/AlEt2Cl) for ethylene--1-hexene copolymerization.Carrier materials,prior to immobilization of the vanadium compound,were pre-treated using two modes:one-step thermal modification and two-steps modification includ-ing additional reaction with AlEt2Cl.It was found that the carrier's type and way of it's modification significantly influence the catalysts activity in ethylene-1-hexene copolymerization as well as the incorporation of higher 1-olefin.The favourable effect of two-step modification mode on the catalysts activity and 1-hexene incorporation efficiency was proposed.