Synthesis And Research Of Late-Transition Metal-Fe(Ⅱ) Catalysts For Ethylene Activation

Linear a-olefins are important petrochemical materials and in particular the C4～C18α-olefins have extensive uses in many fields. They are used primarily as comonomers for the production of linear low-density polyethylene, plasticizers and synthetic lubricants, a-olefins are primarily obtained through the following two processes, cracking of paraffin and oligomerization of ethylene in industrial scale, in which the first process has eventually been replaced by the latter. The methods of ethylene oligomerization including Gulf、Ethyl and SHOP are widely due to rather difficult conditions, especially high pressure.In recent years, the catalytic behavior of late transition metal complexes containing bi-and tri-dentate ligands for polymerization and oligomerization of ethylene to a-olefins has been attracting much attention.In this thesis, several new Fe(Ⅱ) complexes was designed and synthesized as catalysts for ethylene oligomerization. We have modified pyridinebisimine ligands by attaching different substitutents to the para position of aryl group. We have invsetigated the influence of the ligand structure on catalytic activity and oligomer distribution in detail. In addition, the effects of ethylene pressure, the ratio of Al to Fe, reaction temperature on the behavior of ethylene oligomerization have also been in discussion.