乙烯高选择性四聚反应机理研究进展

Research Progress in the Reaction Mechanism for Selective Tetramerization of Ethylene

1–辛烯作为乙烯共聚单体可极大地改善线性低密度聚乙烯的性能,因此乙烯高选择性四聚制1–辛烯得到了广泛关注.本文围绕铬基催化体系催化乙烯四聚反应机理,论述铬活性中心的价态、双膦胺配体、烷基铝助催化剂等关键因素对乙烯四聚反应机制的影响,对乙烯四聚可能存在的单铬金属中心和双铬金属中心反应机理的研究背景及现状进行总结,并提出乙烯四聚机理研究的思路.

Selective tetramerization of ethylene to 1-octene has received growing attention, because 1-octene, as a co-monomer, can improve the properties of linear low-density polyethylene. Focusing on the reaction mechanism of chromium-based catalyst system to ethylene tetramerization, the influence of chromium active state, diphosphinoamine ligands and alkylaluminium cocatalyst on the reaction mechanism of ethylene tetramerization were discussed. The background and de-velopment of possible mononuclear and binuclear mechanism in ethylene tetramerization were reviewed, and the research methodology for the mechanism of ethylene tetramerization was proposed.