Ethylene tetramerization with a highly active and long-lifetime trinuclear diphenylphosphinoamine/Cr(III)/MAO catalyst  

作　　者：JIANG Tao TAO YiQing GAO XiangLu MAO GuoLiang CHEN HongXia CAO ChenGang NING YingNan 

机构地区：[1]College of Material Science and Chemical Engineering,Tianjin University of Science&Technology,Tianjin 300457,China [2]Department of Chemistry and Chemical Engineering,Northeast Petroleum University,Daqing 163318,China

出　　处：《Chinese Science Bulletin》2012年第13期1510-1515,共6页

基　　金：supported by the National Natural Science Foundation of China (U1162114);the Program for New Century Excellent Talents in University;the Program for New Century Excellent Talents in Heilongjiang Provincial University(NCET-06-010);the Science Foundation of Tianjin University of Science & Technology (20090420)

摘　　要：The synthesis and characterization of a novel trinuclear diphosphinoamine ligand 2 are reported. The ligand combined with Cr(III), activated with methylaluminoxane, lead to highly active and long-lifetime catalytic systems for the tetramerization of ethylene to form 1-octene. The effects of reaction temperature, reaction pressure, molar ratio of Al/Cr and bis(diphenylphosphino)amine/Cr on the catalytic activity and product selectivity were studied. Compared with its mononuclear analogue 1, ligand 2 showed a higher catalytic activity and longer lifetime for ethylene tetramerization in the presence of methylaluminoxane as cocatalyst. High molecular weight polyethylene was generated as a by-product with extremely broad molecular weight distributions.The synthesis and characterization of a novel trinuclear diphosphinoamine ligand 2 are reported. The ligand combined with Cr（III）, activated with methylaluminoxane, lead to highly active and long-lifetime catalytic systems for the tetramerization of ethylene to form 1-octene. The effects of reaction temperature, reaction pressure, molar ratio of A1/Cr and bis（diphenylphosphino）amine/Cr on the catalytic activity and product selectivity were studied. Compared with its mononuclear analogue 1, ligand 2 showed a higher catalytic activity and longer lifetime for ethylene tetramerization in the presence of methylaluminoxane as cocatalyst. High molecular weight polyethylene was generated as a by-product with extremely broad molecular weight distributions.

关 键 词：乙烯产生 铬(Ⅲ) 助催化剂 长寿命 高活性 三核 甲基铝氧烷 双膦配体 

分 类 号：O643.36[理学—物理化学] S667.309.3[理学—化学]