Application of polycyclic aryl-substituted imino-phenanthroline ligands in ethylene oligomerization
A series of imino-phenanthroline ligands bearing polycyclic aryl were synthesized and used for ethylene oligomerization over Fe catalysts.The effects of steric and electronic effect of polycyclic aryl on catalytic performance were investigated by ligand modification,and the influence of reaction conditions on catalytic behavior were studied.The results show that those polycyclic aryl-substituted phenanthroline imine ligands exhibit excellent catalytic performance in iron-catalyzed ethylene oligomerization,with an activity of up to 13.60×106 g/(mol·h),an α-olefin selectivity of 92%,and a molar ratio of C14 to C12(K-value)of 0.49.After optimization for reaction conditions,the activity of the catalysts could reach as high as 17.39×106 g/(mol·h),in combination with 96%of α-olefin selectivity and the K-value of 0.63.
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