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Immobilization of metallocene within silica–titania by a non-hydrolytic sol–gel method

Paper ID Volume ID Publish Year Pages File Format Full-Text
42842 45943 2009 14 PDF Available
Title
Immobilization of metallocene within silica–titania by a non-hydrolytic sol–gel method
Abstract

Bis(cyclopentadienyl)zirconium dichloride was immobilized within binary oxides of SiO2–TiO2 via a non-hydrolytic sol–gel route. Different coordinatively unsaturated Ti species were identified within the oxide structure depending on the TiO2 content, which can interact with the encapsulated metallocene complex and affect its catalystic performance in ethylene polymerization. The catalysts were shown to be active in the polymerization using MAO as the cocatalyst in a low Al/Zr ratio. High molecular weight polymer was obtained, probably due to the suppression of chain termination reactions that occur by β-elimination. Furthermore, oxide network structures are suggested from analysis of the catalysts (via Rutherford backscattering spectrometry, infrared spectroscopy, UV–vis diffuse reflectance spectroscopy, diffuse pulse voltammetry), molecular simulation and polymerization performance.

Graphical abstract[Cp2ZrCl2] was immobilized within SiO2–TiO2 via a non-hydrolytic sol–gel route. Different coordinatively unsaturated Ti specimens were identified within the oxide structure depending on the TiO2 content, which interact with the encapsulated metallocene complex affecting its catalyst performance in the ethylene polymerization. Higher activities were found for the catalyst synthesized with the support exhibiting Ti–O–Ti structure. Theoretical calculations showed the interaction formed between the metallocene and the Ti–O–Ti structure.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Metallocene; Sol–gel; Polymerization; Polyethylene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 354, Issues 1–2, 15 February 2009, Pages 88–101
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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