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Ethylene polymerization over supported MAO/(nBuCp)2ZrCl2 catalysts:Influence of support properties.

dc.contributor.authorVan Grieken, R.
dc.contributor.authorCarrero, A.
dc.contributor.authorSuarez, I.
dc.contributor.authorParedes, B.
dc.identifier.citationEuropean Polymer Journal 43 (2007), 1267-1277es
dc.description.abstractThe catalytic system methylaluminoxane (MAO) and bis(n-butylcyclopentadienyl)zirconium dichloride ((nBuCp)2ZrCl2) was immobilized on commercial silica, silica-alumina and aluminophosphate calcined at different temperatures. The properties of the supports were determined by using N2 adsorption-desorption isotherms at 77 K, FT-IR spectroscopy and SEM. After aluminium and zirconium impregnation, the catalysts were analyzed by ICP-AES, FT-IR and UV-Vis spectroscopy. Ethylene polymerizations were carried out in a Schlenk tube at 70 ºC and 1.2 bar of ethylene pressure. The polyethylene obtained was characterized by GPC, DSC and SEM. Catalysts supported on silica-alumina exhibited higher polymerization activity than those supported on silica and aluminophosphate. Besides, the activity of MAO/(nBuCp)2ZrCl2 catalytic system supported on silica-alumina and aluminophosphate decreased strongly with support calcination temperature, while remained almost constant when silica was employed as support. All these experimental features suggest a role of the support acid properties and hydroxyl group population in the generation of active polymerization
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.titleEthylene polymerization over supported MAO/(nBuCp)2ZrCl2 catalysts:Influence of support
dc.subject.unesco23 Químicaes
dc.description.departamentoTecnología Química y Ambiental

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Atribución-NoComercial-SinDerivadas 3.0 EspañaExcept where otherwise noted, this item's license is described as Atribución-NoComercial-SinDerivadas 3.0 España