A Unified Model Explaining Heterogeneous Ziegler-Natta Catalysis

Raffaele Credendino, Dario Liguori, Zhiqiang Fan, Giampiero Morini, Luigi Cavallo

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

We propose a model for MgCl2 supported Ziegler-Natta catalysts capable to reconcile the discrepancies emerged in the last 20 years, when experimental data were tried to be rationalized by molecular models. We show that step defects on the neglected but thermodynamically more stable (104) facet of MgCl2 can lead to sites for strong TiCl4 adsorption. The corresponding Ti-active site is stereoeselective, and its stereoselectivity can be enhanced by coordination of Al-alkyls or Lewis bases in the close proximity. The surface energy of the step defected (104) MgCl2 facet is clearly lower than that of the well accepted (110) facet.
Original languageEnglish (US)
Pages (from-to)5431-5435
Number of pages5
JournalACS Catalysis
Volume5
Issue number9
DOIs
StatePublished - Aug 17 2015

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