Solid-State NMR Investigations of MgCl2 Catalyst Support

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• 作者：E. S. (Merijn) Blaakmeer ; Giuseppe Antinucci ; Vincenzo Busico ; Ernst R. H. van Eck ; Arno P. M. Kentgens
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：March 24, 2016
• 年：2016
• 卷：120
• 期：11
• 页码：6063-6074
• 全文大小：537K
• ISSN：1932-7455

文摘

MgCl₂ is a vital component of Ziegler–Natta catalysts for olefin polymerization. Here we synthesized anhydrous MgCl₂ using different drying protocols and exploited ¹H NMR to quantify the proton content. We report on our study of neat and ball-milled MgCl₂ samples by means of ²⁵Mg and ³⁵Cl solid-state NMR. DFT calculations of the quadrupole tensor aid in analysis of the spectra. The results show that, due to the morphology of the neat particles, a preferred orientation is induced which manifests itself in unusual powder line shapes. Ball milling reduces particle size, which subsequently leads to a small distribution of quadrupole parameters for the bulk. Surface sites, highly relevant for catalysis, are not directly observed, due to their broad lines of low intensity.