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

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...

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Bibliographic Details
Published in:Chinese science bulletin 2012-05, Vol.57 (13), p.1510-1515
Main Authors: Jiang, Tao, Tao, YiQing, Gao, XiangLu, Mao, GuoLiang, Chen, HongXia, Cao, ChenGang, Ning, YingNan
Format: Article
Language:English
Subjects:
aluminum
Byproducts
Catalysts
Catalytic activity
Chemistry/Food Science
Chromium
Earth Sciences
Engineering
Ethylene
Humanities and Social Sciences
Life Sciences
Ligands
Molecular weight
Molecular weight distribution
multidisciplinary
Physics
polyethylene
Science
Science (multidisciplinary)
temperature
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Summary: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.
ISSN:1001-6538
1861-9541
DOI:10.1007/s11434-012-5032-3