Abstract
A series of zirconium salen-type complexes were prepared by using ZrCl 4 and sodium salts of the tetradentate Schiff base ligands. In combination with Et 2AlCl, they displayed moderate to high catalytic activities in ethylene oligomerization under a pressure of 1.0–1.8 MPa at 150 °C in toluene. The main products are C 4–C 10 olefins with good selectivity to linear α-olefins. The turnover frequency (TOF) of catalyst system Zr(salen)Cl 2·THF/Et 2AlCl, under a pressure of 1.8 MPa and in an Al/Zr molar ratio of 300, was 4.93×10 4 h −1 with a satisfactory selectivity to C 4–C 10 olefins (89%), and linear α-olefins accounted for 95%. The steric and conjugate effects of the ligands on ethylene oligomerization, as well as the effects of cocatalysts, the Al/Zr molar ratios, the reaction temperature, the ethylene pressure, and the lifetime of the catalysts were studied.
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