Homogeneous and supported catalysts based on bis(imino)pyridyl Iron(II) complexes for ethylene polymerization

被引：0
|
作者：
V. A. Zakharov
N. V. Semikolenova
T. B. Mikenas
A. A. Barabanov
G. D. Bukatov
L. G. Echevskaya
M. A. Mats’ko
机构：
[1] Russian Academy of Sciences,Boreskov Institute of Catalysis, Siberian Division
来源：
Kinetics and Catalysis | 2006年 / 47卷
关键词：
Imino; Lewis Acid Site; TIBA; Ethylene Polymerization; Natta Catalyst;
D O I：
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中图分类号：
学科分类号：
摘要：
Data on ethylene polymerization on homogeneous and supported catalysts based on 2,6-bis(imino)pyridyl Fe(II) complexes activated by trialkylaluminums are considered (activity, the molecular-weight characteristics of polymers, the number of active sites, and the propagation rate constants). Unlike homogeneous systems, the supported catalysts prepared with the use of various carriers (SiO2, Al2O3, and MgCl2) exhibited high stability and activity at 70–80°C and produced high-molecular-weight polyethylene with a broad molecular-weight distribution (MWD). The molecular weights and MWDs of polymers and the propagation rate constant depended on the nature of the carrier only slightly. The reasons for an unusual effect of an increase in the activity of the supported catalysts in ethylene polymerization in the presence of hydrogen are discussed.
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页码：303 / 309
页数：6
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