Chromium Catalysts for Selective Ethylene Oligomerization Featuring Binuclear PNP Ligands

Author:

Meng Xiangyang1,Ding Zhiqiang1,Gao Huan1,Ma Zhe1,Pan Li1ORCID,Wang Bin1ORCID,Li Yuesheng1

Affiliation:

1. Tianjin Key Laboratory of Composite & Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China

Abstract

A series of novel binuclear PNP ligands based on the cyclohexyldiamine scaffold were synthesized for this study. The experimental results showed that positioning the two PNP sites at the para-positions of the cyclohexyl framework led to a significant enhancement in the catalytic activity for selective tri/tetramerization of ethylene. The PNP/Cr(acac)3/MAO(methylaluminoxane) catalytic system exhibited relatively high catalytic activity (up to 3887.7 kg·g−1·h−1) in selective ethylene oligomerization with a total selectivity of 84.5% for 1-hexene and 1-octene at 40 °C and 50 bar. The relationship between the ligand structure and ethylene oligomerization performance was further explored using density functional theory calculations.

Funder

National Natural Science Foundation of China

Publisher

MDPI AG

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