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Precise Active Site Analysis for TiCl3/MgCl2 Ziegler-Natta Model Catalyst Based on Fractionation and Statistical Methods

School of Materials Science, Japan Advance Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
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Catalysts 2013, 3(1), 137-147; https://doi.org/10.3390/catal3010137
Received: 17 December 2012 / Revised: 30 January 2013 / Accepted: 1 February 2013 / Published: 7 February 2013
(This article belongs to the Special Issue Molecular Catalysis for Precise Olefin Polymerization)
In heterogeneous Ziegler-Natta catalysts for olefin polymerization, isolation of a single type of active sites is a kind of ambition, which would solve long-standing questions on the relationship between active site and polymer structures. In this paper, polypropylene produced by TiCl3/MgCl2 model catalysts with minimum Ti heterogeneity was analyzed by combined solvent fractionation and the two-site statistical model. We found that the active sites of the model catalysts were classified into only three types, whose proportions were dependent on the Ti dispersion state. The addition of external donors not only newly formed highly isospecific sites, but also altered the stereochemical nature of the other active sites. View Full-Text
Keywords: Ziegler-Natta catalysts; propylene polymerization; model catalyst; active site; two-site model analysis Ziegler-Natta catalysts; propylene polymerization; model catalyst; active site; two-site model analysis
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Takahashi, S.; Wada, T.; Taniike, T.; Terano, M. Precise Active Site Analysis for TiCl3/MgCl2 Ziegler-Natta Model Catalyst Based on Fractionation and Statistical Methods. Catalysts 2013, 3, 137-147.

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