Abstract：In order to develop non-metallocene-late-transition metal catalysts for ethylene oligomerization with high activity and good flexibility in regulation, a new late-transition metal catalyst with multi-membered ring was synthesized from diiodide compounds with conjugated diene structure, and ethylene oligomerization was catalyzed by the synthesized catalyst combined with methyl aluminoxane (MAO). The structures of ligands and catalysts were determined by means of nuclear magnetic resonance hydrogen spectroscopy (1H NMR) and fourier transform infrared spectroscopy(FT-IR). The effects of reaction conditions, such as polymerization pressure and temperature, molar ratio of Al/Ni, on catalytic activities were also investigated. The results showed that the catalytic activity increased significantly and the yield of by-product polymer also increased with the increase of reaction pressure. The activities of the synthesized catalysts were the highest under 500 molar ratio of Al/Ni and 30 ℃, among which the activity of Cat-3 reached to 8×105 g/(mol-Cat·h). In addition to some polymers, the liquid phase products were mainly C4-C24 olefins.
Jiang Yan 1,Mao Guoliang 2,Huo Hongliang 1 et al. Synthesis of Late Transition Metal Complex with Multimembered Ring and Their Catalytic Performance for Ethylene Polymerization[J]. 化学反应工程与工艺, 2018, 34(5): 448-453.
