Effects of MgCl2 crystallographic structure on active centre formation in immobilized single-centre and Ziegler-Natta catalysts for ethylene polymerization

R. Huang, F. Malizia, G. Pennini, C.E. Koning, J.C. Chadwick

Research output: Contribution to journalArticleAcademicpeer-review

29 Citations (Scopus)

Abstract

The ability of a MgCl2 support to activate a transition metal catalyst has been found to depend both on the crystallographic structure of the support and on the nature of the catalyst. A high degree of crystallographic disorder can be very effective for the immobilization and activation of titanium and vanadium complexes, but is not necessarily effective for zirconocene activation. A highly disordered support prepared by the reaction of MgBu2 with HCl gave high activity with TiCl4 but low activity with (n-PrCp)2ZrCl2. High polymerization activities with the zirconocene were only obtained with supports of type MgCl2/AlRn(OEt)3-n prepared from the reaction of AlR3 with MgCl2 · 1.1EtOH. These supports are characterized by additional peaks in the X-ray diffraction pattern, indicating the presence of a crystalline structure which is absent in the other supports and contains highly Lewis acidic sites able to generate the active metallocenium species.
Original languageEnglish
Pages (from-to)1732-1738
JournalMacromolecular Rapid Communications
Volume29
Issue number21
DOIs
Publication statusPublished - 2008

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Magnesium Chloride
Catalyst supports
Ethylene
Chemical activation
Polymerization
Catalysts
Vanadium
Diffraction patterns
Transition metals
Titanium
Crystalline materials
X ray diffraction
ethylene
Zirconocene dichloride

Cite this

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title = "Effects of MgCl2 crystallographic structure on active centre formation in immobilized single-centre and Ziegler-Natta catalysts for ethylene polymerization",
abstract = "The ability of a MgCl2 support to activate a transition metal catalyst has been found to depend both on the crystallographic structure of the support and on the nature of the catalyst. A high degree of crystallographic disorder can be very effective for the immobilization and activation of titanium and vanadium complexes, but is not necessarily effective for zirconocene activation. A highly disordered support prepared by the reaction of MgBu2 with HCl gave high activity with TiCl4 but low activity with (n-PrCp)2ZrCl2. High polymerization activities with the zirconocene were only obtained with supports of type MgCl2/AlRn(OEt)3-n prepared from the reaction of AlR3 with MgCl2 · 1.1EtOH. These supports are characterized by additional peaks in the X-ray diffraction pattern, indicating the presence of a crystalline structure which is absent in the other supports and contains highly Lewis acidic sites able to generate the active metallocenium species.",
author = "R. Huang and F. Malizia and G. Pennini and C.E. Koning and J.C. Chadwick",
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Effects of MgCl2 crystallographic structure on active centre formation in immobilized single-centre and Ziegler-Natta catalysts for ethylene polymerization. / Huang, R.; Malizia, F.; Pennini, G.; Koning, C.E.; Chadwick, J.C.

In: Macromolecular Rapid Communications, Vol. 29, No. 21, 2008, p. 1732-1738.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Effects of MgCl2 crystallographic structure on active centre formation in immobilized single-centre and Ziegler-Natta catalysts for ethylene polymerization

AU - Huang, R.

AU - Malizia, F.

AU - Pennini, G.

AU - Koning, C.E.

AU - Chadwick, J.C.

PY - 2008

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N2 - The ability of a MgCl2 support to activate a transition metal catalyst has been found to depend both on the crystallographic structure of the support and on the nature of the catalyst. A high degree of crystallographic disorder can be very effective for the immobilization and activation of titanium and vanadium complexes, but is not necessarily effective for zirconocene activation. A highly disordered support prepared by the reaction of MgBu2 with HCl gave high activity with TiCl4 but low activity with (n-PrCp)2ZrCl2. High polymerization activities with the zirconocene were only obtained with supports of type MgCl2/AlRn(OEt)3-n prepared from the reaction of AlR3 with MgCl2 · 1.1EtOH. These supports are characterized by additional peaks in the X-ray diffraction pattern, indicating the presence of a crystalline structure which is absent in the other supports and contains highly Lewis acidic sites able to generate the active metallocenium species.

AB - The ability of a MgCl2 support to activate a transition metal catalyst has been found to depend both on the crystallographic structure of the support and on the nature of the catalyst. A high degree of crystallographic disorder can be very effective for the immobilization and activation of titanium and vanadium complexes, but is not necessarily effective for zirconocene activation. A highly disordered support prepared by the reaction of MgBu2 with HCl gave high activity with TiCl4 but low activity with (n-PrCp)2ZrCl2. High polymerization activities with the zirconocene were only obtained with supports of type MgCl2/AlRn(OEt)3-n prepared from the reaction of AlR3 with MgCl2 · 1.1EtOH. These supports are characterized by additional peaks in the X-ray diffraction pattern, indicating the presence of a crystalline structure which is absent in the other supports and contains highly Lewis acidic sites able to generate the active metallocenium species.

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DO - 10.1002/marc.200800456

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