Structure Determination of the δ-MgCl2 Support in Ziegler-Natta Catalysts

Toru WADA; Gentoku TAKASAO; Minoru TERANO; Patchanee CHAMMINGKWAN; Toshiaki TANIIKE

doi:10.1627/jpi.65.88

Review Paper

Structure Determination of the δ-MgCl₂ Support in Ziegler-Natta Catalysts

Toru WADA , Gentoku TAKASAO, Minoru TERANO, Patchanee CHAMMINGKWAN, Toshiaki TANIIKE

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Keywords: Ziegler-Natta catalyst, Structural disorder, Nanocrystal, Synchrotron, Total scattering, Pair distribution function

JOURNAL FREE ACCESS

2022 Volume 65 Issue 3 Pages 88-96

DOI https://doi.org/10.1627/jpi.65.88

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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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