Title
Probing the coordinative unsaturation and local environment of <tex>$Ti^{3+}$</tex> sites in an activated high-yield Ziegler-Natta catalyst Probing the coordinative unsaturation and local environment of <tex>$Ti^{3+}$</tex> sites in an activated high-yield Ziegler-Natta catalyst
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Weinheim ,
Subject
Chemistry
Source (journal)
Angewandte Chemie: international edition in English. - Weinheim
Volume/pages
54(2015) :16 , p. 4857-4860
ISSN
1433-7851
ISI
000352622400030
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The typical activation of a fourth generation ZieglerNatta catalyst TiCl4/MgCl2/phthalate with triethyl aluminum generates Ti3+ centers that are investigated by multi-frequency continuous wave and pulse EPR methods. Two families of isolated, molecule-like Ti3+ species have been identified. A comparison of the experimentally derived g tensors and 35,37Cl hyperfine and nuclear-quadrupole tensors with DFT-computed values suggests that the dominant EPR-active Ti3+ species is located on MgCl2(110) surfaces (or equivalent MgCl2 terminations with tetra-coordinated Mg). O2 reactivity tests show that a fraction of these Ti sites is chemically accessible, an important result in view of the search for the true catalyst active site in olefin polymerization.
E-info
https://repository.uantwerpen.be/docman/iruaauth/13828d/e5e3eaf9d43.pdf
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