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lUM-7l oG' H ' ', łm.'ccz,Ą],Ą '\AT^lI^\U'KoVĄlF\A Silica powder obtained bysol-8el metho.l as a support of ortanometalli. vanadium catalyst for ethylene polymerization RAPID COMMUNICATION sumnary Sol gcltc.hniquc was enployed roobbin thc s ili.i,iy p. pow d.i vhich aftcl nrodjfi.iiion proredure was aPPlicd a suppoł 01Ór ganondi]li. c ilyiic syśen for rdlylĆne polyń iz iol Tlt powds PrG dud lvis synlhcsju.d usins hydblysis ańd condcnsation 01TEos, rhl],zcd by mmoi.' obbin€ d młłial and a Ęfer.Dc suPpolt (.omnelciil 'lrc Davisil) lvere d'aradd]zed lo deiemmc thef Palticl€ si? dishńutjons, BET surla.e al.a, porc voluńc and diamcie. Gis.phase adsorption of Vanadju cłblyśoń'nalyzcdsuPPo m eliłhaswPllasadsorPiionhonthesolution atrił mabria ls wcrc ihem a lly pret.a lod Pnor.ih]vti. sy9ems syntlrcas and thĆ innucn.c ol modjfi.atnrn ńethod apPlild on rr llins ol8anońctallic c alyś.hiracfu wa5 $titahd in low-Pr*slte slufy Polvńdizahon ot cihylcn.' obhimd l$ul6 Prov. dttsol. gel ńabńal' duc to its advinbgeous moĘhologv Wth widc łnd shal]o\' Pl[cs, allows b obhin cahlytic sydons o1lĘher adiYity in low_preŚue ethy lcn. polymcńz.iion, in conPa dsol wi lh Ćońn {cń l sili.a Davis il '

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Silica-type materials with different structure and morphology, synthesized using sol-gel process, were applied as a carriers of organometallic catalytic systems (VOCl 3 /AlEt 2 Cl) 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 including additional reaction with AlEt 2 Cl. 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.