Journal of the Japan Petroleum Institute
Online ISSN : 1349-273X
Print ISSN : 1346-8804
ISSN-L : 1346-8804
Review Paper
Structure Determination of the δ-MgCl2 Support in Ziegler-Natta Catalysts
Toru WADA Gentoku TAKASAOMinoru TERANOPatchanee CHAMMINGKWANToshiaki TANIIKE
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2022 Volume 65 Issue 3 Pages 88-96

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Abstract

δ-MgCl2 support is an essential component of highly active Ziegler-Natta catalysts. The microstructure of δ-MgCl2 in modern industrial catalysts is extremely disordered, so is hard to determine using only powder X-ray diffraction (PXRD). Several structural models have been proposed, such as nano-sized platelet crystallites and one-dimensional chain-like structures. We used atomic pair distribution function (PDF) based on total X-ray scattering and simulations with nanoparticle models in addition to PXRD to investigate the detailed structure of δ-MgCl2. We found that δ-MgCl2 in modern catalysts consists of nano-sized platelet crystallites with stacking disorder, regardless of the preparation protocol. Here, we review our recent findings of the structure determination of δ-MgCl2.

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