Immobilization of η5-cyclopentadienyltris(dimethylamido) zirconium polymerization catalysts on a chlorosilane- and HMDS-modified mesoporous silica surface: A new concept for supporting metallocene amides towards heterogeneous single-site-catalysts

Horst Schneider, Gerd T. Puchta, Franz A.R. Kaul, Gabriele Raudaschl-Sieber, Frédéric Lefebvre, Guillaume Saggio, Dimitrios Mihalios, Wolfgang A. Herrmann*, Jean-Marie Maurice Basset

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The modification of a mesoporous silica surface with Si(Ind)(CH3)2Cl and the immobilization of CpZr(NMe2)3 on this surface was studied via IR-spectroscopy. To reduce side reactions, the indenyl-modified silica was reacted with hexamethyldisilazane (HMDS) under IR-control before the CpZr(NMe2)3-immobilization. The role of the hydroxyl group protection with HMDS is discussed. The surface modifications have been repeated via Schlenk technique at the same conditions and the surface modifications were studied with 13C CP MAS-NMR, 1H MAS-NMR, elemental-, SEM- and BET-analysis. The surface species of the resulting catalysts are discussed. The precatalysts have been treated with methylaluminoxane (MAO) (Al:Zr (mol:mol) = 500:1) and the resulting Zr contents (leaching-effect) are discussed. All catalysts have been tested in ethylene and propylene polymerization.

Original languageEnglish (US)
Pages (from-to)127-141
Number of pages15
JournalJournal of Molecular Catalysis A: Chemical
Volume170
Issue number1-2
DOIs
StatePublished - May 14 2001

Keywords

  • Heterogeneous catalysts
  • Leaching
  • Metallocene
  • Polymerization
  • Surface chemistry

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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