Research Progress on Supported Ziegler-Natta Catalysts——Activation of MgCl2 Support and Its Influences on Olefin Polymerizations
The supported Ziegler-Natta catalyst utilizing MgCl2 as carrier holds paramount significance in the synthesis of polyolefins,notably polyethylene and polypropylene.The inherent characteristics of the carrier of Ziegler-Natta catalyst-activated MgCl2,such as particle structure and morphology,play an important role in regulating the spatial distribution and electronic effects of active species,which then determine the catalytic features of the final Ziegler-Natta catalyst(such as catalytic activity and stereoselectivity).This article provides a comprehensive review on the influences of activation methods of MgCl2 carrier on the morphology,structure,and composition of the carrier precursors and the prepared Ziegler-Natta pre-catalysts,and the olefin catalytic properties of the pre-catalysts.Based on the industrial applications of the various pre-catalysts,the high-performance polyolefin catalysts in the future are prospected.
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