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Citation: LI San-Xi. MgCl₂-supported Titanium and Hafnium Bimetallic High Activity Catalyst for Ethylene Homo- and Copolymerization[J]. Chinese Journal of Applied Chemistry, ;2001, 18(5): 412-415. shu

MgCl₂-supported Titanium and Hafnium Bimetallic High Activity Catalyst for Ethylene Homo- and Copolymerization

LI San-Xi

1.
Department of Materials Science and Engineering, Shenyang Institute of Chemical Technology, Shenyang 110021

Received Date: 5 February 2001
Available Online: 9 April 2001
Fund Project: 辽宁省科学技术基金项目(002008) (002008)辽宁省教育厅高等学校科学研究项目(20012066) (20012066)

Titanium and hafnium bimetallic catalyst prepared by chemical reaction method using MgCl₂ as support shows a high activity and good polymer particle size distribution. Compared with catalyst containing only titanium, the titanium-hafnium bimetallic catalyst exhibits better performance and produces polyethylenes with higher molecular weight and wider molecular weight distribution and gives lower density copolymer of ethylene with butene-1. The MFR values of polyethylene obtained decrease with increase in partial hydrogen pressure. High molecular weight shoulders in GPC profile demonstrates that moderate or low molecular weight polyethylene is due to the titanium species while the hafnium active species produce high molecular weight polyethylene. This bimetallic catalyst is suggested to have a promising application in production of polyethylenes with broad molecular weight distributions.
- ethylene polymerization,
- ethylene-butene copolymerization,
- titanium-hafnium bimetallic catalyst
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MgCl₂-supported Titanium and Hafnium Bimetallic High Activity Catalyst for Ethylene Homo- and Copolymerization