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1.概述 本世纪50年代Ziegler-Natta催化体系的发现使均相络合催化研究得到突飞猛进的发展。各种各样的Ziegler-Natta催化剂已广泛被用于烯烃聚合的工业生产中。与此同时对此催化剂的作用机理和催化活性物种也做了大量的研究。在提出的许多机理中,虽然金属氢化物机理在理论上已越来越多地被人们所接受,但仍需有新的更使人信服的实验来证实。 1971年Jones在研究Ni(acac)_2和Et_2AlOEt组成的催化剂催化丙烯齐聚反应时提出了氢化物机理;1979年Keim在用镍络合物作为丙烯齐聚催化剂时,曾指出其反应过
1. Overview The discovery of the Ziegler-Natta catalytic system in the 1950s led to the rapid development of homogeneous complexation catalysis. A wide variety of Ziegler-Natta catalysts have been widely used in the industrial production of olefin polymerization. At the same time, a lot of research has been done on the mechanism of action and the catalytically active species of this catalyst. Among the many mechanisms proposed, although the mechanism of metal hydride has been theoretically accepted more and more, new and more convincing experiments are needed to confirm this. In 1971, Jones proposed the hydride mechanism in the study of the oligomerization of propylene catalyzed by a catalyst consisting of Ni (acac) 2 and Et 2 AlOEt. When Keim used nickel complex as propylene oligomerization catalyst in 1979,