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

Abstract

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.

Copolymerization of ethylene with higher 1-olefins over vanadium catalyst supported on Al(i-Bu) 3 modified magnesium carrier

“…The similar advantageous result of carrier modification with an organoaluminum compound, i.e. improved efficiency of comonomer incorporation, was observed for the vanadium catalyst anchored on silica produced by sol-gel method and additionally modified with diethylchloroaluminum [24]. Galland et al stated that low activities of supported metallocene catalysts in ethylene/1-hexene copolymerization could be attributed to the steric hindrance caused by the silica surface, which played the role of a huge ligand preventing the access of monomers to the catalysts' centers [25].…”

Metal salen complexes as ethylene polymerization catalysts - effect of catalytic system composition on its activity and properties of polymerization products

“…All these systems have been continually inspiring researchers to elaborate better and better catalysts [e.g. [1][2][3][4][5][6]. The revolutionary development of the catalytic systems can be considered as the key of huge evolution within the field of olefins' polymerization processes [7][8][9][10].…”

Ethylene Polymerization over MgCl2/SiO2 Bi‐Supported Ziegler–Natta Hybrid Titanium/Vanadium Catalysts

“…The copolymerization ability of the catalysts or active sites depended on many factors, like supports, components, ligands, donors, polymerization conditions, etc. Białek et al investigated the VOCl 3 /AlEt 2 Cl/SiO 2 catalyst system for ethylene/1‐hexene copolymerization. It was found that the type of the carrier and mode of its preparation and modification have important influence on the catalysts activity in the ethylene/1‐hexene copolymerization process and on the comonomer incorporation.…”