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Supported metallocene on mesoporous materials

Paper ID Volume ID Publish Year Pages File Format Full-Text
43367 45966 2007 11 PDF Available
Title
Supported metallocene on mesoporous materials
Abstract

A series of hybrid supported catalysts was prepared by sequentially grafting Cp2ZrCl2 and (nBuCp)2ZrCl2 (1:3 ratio) onto alumino-silicates (MCM-41, SBA-15, MCM-22, ITQ-2), alumina and chrysotiles (native and leached). Supports and catalysts were characterized by Rutherford backscattering spectrometry, atomic force microscopy and nitrogen adsorption. Grafted metal content laid between 0.2 and 0.8 wt.% Zr/SiO2 and 0.9 wt.% Zr/Al2O3. All the systems were shown to be active in ethylene polymerization with methylaluminoxane as the cocatalyst. Catalyst activity and molecular weight were shown to depend on the textural characteristic of the silicas, namely grain size and pore diameter. The highest activity in ethylene polymerization (ca. 3200 kg PE mol Zr−1 h−1) was obtained with the supported catalyst using SBA-15 with average particle size around 0.21 μm. Resulting polymers were characterized by gel permeation chromatography and differential scanning calorimetry.

Graphical abstractA series of hybrid supported catalysts was prepared by sequentially grafting Cp2ZrCl2 and (nBuCp)2ZrCl2 (1:3 ratio) onto alumino-silicates, alumina and chrysotile. The supported catalysts were characterized by Rutherford backscattering spectrometry, atomic force microscopy and nitrogen adsorption grafted metal content. Catalyst activity and polyethylene molecular weight were shown to be dependent on textural properties of the supports. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Supported metallocenes; MCM-22; SBA-15; Chrysotile; ITQ-2; AFM
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 333, Issue 1, 3 December 2007, Pages 96–106
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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