Catalyst for ethylene selective tetramerization and application thereof

The invention provides a catalyst for ethylene selective tetramerization and application thereof. The catalyst comprises a binuclear halogenated pyridine imine metal complex as shown in a formula I or a formula II, in the formula I and the formula II, R is independently selected from n = 0, 1, 2, 3, 4 and 5, or R1 and R1'are independently selected from one of hydrogen, substituted or unsubstituted C1-C6 alkyl and substituted or unsubstituted C6-C15 aryl; r1, R2, R3, R4, R5 and R2 ', R3', R4 'and R5' are independently selected from one of hydrogen, substituted or unsubstituted C1-C6 alkyl, halogen, substituted or unsubstituted C1-C6 alkoxy, substituted or unsubstituted C6-C15 aryl and nitryl, M1 is selected from one of Fe < 2 + >, Co < 2 + > and Ni < 2 + >, M2 is Fe < 3 + >, and X is independently selected from one of halogen. The catalyst has excellent ethylene oligomerization activity and 1-octene selectivity. 本发明提供一种用于乙烯选择性四聚的催化剂及其应用。该催化剂包括式I或式II所示的双核卤化吡啶亚胺金属配合物：式I和式II中，R独立选自n＝0,1,2,3,4,5，或R1与R1'独立选自氢、取代或未取