文献类型：期刊文献

英文题名：Highly active chromium-based selective ethylene tri-/tetramerization catalysts supported by N, N-diphospholylamines

作者：Ji, Xiaoyu;Song, Liubing;Zhang, Chengye;Jiao, Jiajun;Zhang, Jun[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Mei Long Rd, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, 130 Mei Long Rd, Shanghai 200237, Peoples R China

年份：2017

卷号：466

起止页码：117

外文期刊名：INORGANICA CHIMICA ACTA

收录：;EI(收录号：20202208749013);WOS:【SCI-EXPANDED(收录号:WOS:000410683500014)】；

基金：Financial support from Shanghai Pujiang Talent Program (11PJ1402500) and the National Natural Science Foundation of China for financial support (21671066) is greatly acknowledged.

语种：英文

外文关键词：Ethylene oligomerization; Chromium complex; Ethylene trimerization; Ethylene tetramerization

摘要：We have developed novel Cr(III) catalysts supported by asymmetic N, N-diphospholylamine ligands bearing a phenoxaphosphine group. Upon activation with MMAO-3A, the Cr(III) catalysts supported by the PNP ligands are highly active for ethylene tri-/tetramerization with considerable selectivity. The ligand substitution and oligomerization conditions are found to be essential to achieve high activity and controllable selectivity. The catalytic system with asymmetric diphospholylamine ligands exhibited higher activity than that supported by symmetric ligands. Asymmetric diphospholylamine ligand with a N-cyclohexyl group achieved the highest activity of 282.2 kg/(g Cr/h) with a high total selectivity of 83.2% toward valuable 1-hexene (28.7%) and 1-octent (54.5%) at 35 bar under 80 degrees C. (C) 2017 Published by Elsevier B.V.