𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A Preparation Method for Well-Defined Crystallites of Mgcl2-Supported Ziegler-Natta Catalysts and their Observation by AFM and SEM

✍ Scribed by Adelaida Andoni; John C. Chadwick; Hans J. W. Niemantsverdriet; Peter C. Thüne

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
430 KB
Volume
28
Category
Article
ISSN
1022-1336

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

A method for the preparation of well‐defined crystallites of MgCl~2~‐supported Ziegler‐Natta catalysts on Si wafers has been developed. This has been achieved by the spin‐coating of a MgCl~2~ solution onto a flat Si wafer, followed by controlled crystal growth to give well‐defined MgCl~2~ · __n__EtOH crystallites. The growth of the crystallites on the flat silica facilitates their characterization using electron and scanning probe microscopy. The relative proportions of 120° and 90° edge angles indicate the preference for the formation of a particular crystallite face for the MgCl~2~. Polyethylene has been identified to be formed on the lateral faces of the crystallite.

magnified image

📜 SIMILAR VOLUMES

Polymerization of ethylene and ethylene/
Polymerization of ethylene and ethylene/1-hexene over Ziegler–Natta/metallocene hybrid catalysts supported on MgCl2 prepared by a recrystallization method
✍ Han Seock Cho; Jin Suk Chung; Jae Hyuck Han; Young Gwan Ko; Wha Young Lee 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 216 KB 👁 2 views

MgCl 2 for use as a catalyst support was prepared by dissolution in methanol and recrystallization in n-decane, followed by vacuum-drying at 2,000 rpm. The prepared support was modified by treatment with alkylaluminum compounds. The activity profile of ethylene over the supported catalysts persisted