Cyclopentadienyl surface as a support for zirconium polyethylene catalysts

Eero I. Iiskola, Sari Timonen, Tuula T. Pakkanen*, Outi Härkki, Petri Lehmus, Jukka V. Seppälä

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    64 Citations (Scopus)

    Abstract

    A novel ethylene polymerization catalyst is prepared by supporting CpZrCl 3 on chemically modified silica. The surface modification of silica was carried out by utilizing the saturated gas-solid reactions of a silane coupling agent, Cp(CH 2) 3Si(OCH 2CH 3) 3, and a partially dehydroxylated silica. Immobilization of CpZrCl 3 onto the cyclopentadienyl surface formed on the silica was done using liquid-phase reactions. The stepwise-prepared materials were characterized by 13C and 29Si solid state NMR and FT-IR spectroscopy. This supported catalyst system has a high activity and can be used to produce polyethylene with a narrow molecular weight distribution in the presence of methylaluminoxane. The immobilization of CpZrCl 3 on the cyclopentadienyl surface of SiO 2 more than doubled the polymerization activity of CpZrCl 3. However, the direct heterogenization of CpZrCl 3 onto an unmodified, partially dehydroxylated silica produced a catalyst with a very low activity. The effect of surface modification reactions and structure of the support on the catalyst performance is presented and discussed.

    Original languageEnglish
    Pages (from-to)2853-2859
    Number of pages7
    JournalMacromolecules
    Volume30
    Issue number10
    DOIs
    Publication statusPublished - 19 May 1997
    MoE publication typeA1 Journal article-refereed

    Keywords

    • activated catalyst support
    • cyclopentadienyl surface
    • FT-IR spectroscopy
    • methylaluminoxane
    • polyethylene catalysts
    • solid state NMR
    • supported metallocene catalysts

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