文献类型：期刊文献

英文题名：Highly active chromium-based selective ethylene tri-/tetramerization catalysts supported by PNPO phosphazane ligands

作者：Zhou, Yusheng[1,2];Wu, Hongfei[3];Xu, Sheng[1,2];Zhang, Xuejun[1,2];Shi, Min[1,2,4];Zhang, Jun[1,2]

机构：[1]E China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]SINOPEC, Beijing Res Inst Chem Ind, Yanshan Branch, Beijing 102500, Peoples R China;[4]Chinese Acad Sci, Shanghai Inst Organ Chem, State Key Lab Organometall Chem, Shanghai 200032, Peoples R China

年份：2015

卷号：44

期号：20

起止页码：9545

外文期刊名：DALTON TRANSACTIONS

收录：;EI(收录号：20152400929679);WOS:【SCI-EXPANDED(收录号:WOS:000354999800026)】；

基金：Financial support from the Shanghai Pujiang Talent Program (11PJ1402500), the Fundamental Research Funds for the Central Universities (WK1114014), and the National Natural Science Foundation of China (21171056, u1162111 and u1362111) is greatly acknowledged.

语种：英文

外文关键词：Chromium compounds - Catalyst supports - Catalyst selectivity - Ethylene

摘要：Novel Cr(III) catalysts supported by PNPO phosphazane ligands of the type Ph2PN(R)P(Ph)OAr have been prepared, all of which, upon activation with MMAO-3A, are highly active in ethylene tri-/tetramerization with considerable selectivity. The effect of ligand substitution on the catalytic performance has been examined. The Cr precatalyst supported by the PNPO phosphazane ligand with an N-cyclohexyl achieved high activity of 316.7 kg (g Cr h(-1))(-1) and a high total selectivity of 85.1% towards valuable 1-hexene (45.7%) and 1-octene (39.4%) using chlorobenzene as the solvent at 35 bar and 40 degrees C. In methylcyclohexane, the precatalyst supported by [Ph2PN(Pr-i)P(Ph)OPh] exhibited a higher 1-octene selectivity (54.0%) with a considerable activity of 73.3 kg (g Cr h(-1))(-1) at 35 bar and 40 degrees C. With the fine-tuned ligand backbone, such a PNPO phosphazane-based catalyst system provides a mode for precise understanding of the impact of ligand variations on catalytic performance.