Role of Titanium in Ti/SiO2-Supported Metallocene-based Olefin Polymerization Catalysts. Part 2: Particle Fragmentation

Silvia Zanoni, Nikolaos Nikolopoulos, Alexandre Welle, Virginie Cirriez, Bert M. Weckhuysen*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

A commercial SiO2 modified by the addition of a TiO2 layer on its surface and pore walls offers a support for metallocene-based ethylene polymerization catalysts with a 35 % improved catalytic activity. The effect of such support modification on the catalyst particle fragmentation during polymerization reactions were assessed. This was performed by exposing the internal cross-section of several SiO2 and Ti/SiO2-based metallocene catalyst particles, polymerized at a wide range of reaction conditions, with a Focused-Ion Beam Scanning Electron Microscope (FIB-SEM), followed by a semi-quantitative analysis of polymer, catalyst and macropores of each 2D image obtained. The titanation of the SiO2 lead to a support framework that fractures earlier and more efficiently. This was evidenced by the presence of several empty (polymer-free) cracks along the support dense-shell, found more extensively in the Ti-modified polymerized catalyst particle, which also resulted in a more sustained polymerized particles macroporosity during the course of the reaction.

Original languageEnglish
Article numbere202300222
Pages (from-to)1-12
Number of pages12
JournalChemCatChem
Volume15
Issue number10
DOIs
Publication statusPublished - 19 May 2023

Keywords

  • fragmentation
  • metallocene
  • polymerization
  • support
  • titania

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