Nickel Complexes Based on Salicylaldehyde-imine Ligands: Synthesis, Characterization and Catalytic Oligomerization of Ethylene

doi:10.1007/s40242-018-8186-y

Chemical Research in Chinese Universities ›› 2018, Vol. 34 ›› Issue (6): 945-951.doi: 10.1007/s40242-018-8186-y

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Nickel Complexes Based on Salicylaldehyde-imine Ligands: Synthesis, Characterization and Catalytic Oligomerization of Ethylene

CHEN Liduo¹, HUO Hongliang², WANG Libo², MA Lili², JIANG Yan², XIE Junyi¹, WANG Jun¹

1. Provincial Key Laboratory of Oil and Gas Chemical Technology, College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, P. R. China;
2. Daqing Chemical Research Center of PetroChina Petrochemical Research Institute, Daqing 163714, P. R. China

Received:2018-06-04 Online:2018-12-01 Published:2018-09-29
Contact: WANG Jun E-mail:wangjun1965@yeah.net
Supported by:
Supported by the National Key R&D Program of China(No.2017YFB0306701).

Abstract

Abstract: A series of nickel complexes {NOON^R}Ni(A:R=Me; B:R=t-Bu; C:R=OMe) based on salicylaldehyde-imine ligands was synthesized through Schiff base condensation and metal complexation reaction. Upon activation with methylaluminoxane(MAO), nickel complexes A-C all exhibited good catalytic activity[turnover frequency=5.2×10⁵-16.3×10⁵ g/(mol Ni·h)] and oligomer selectivity(above 85%, mass fraction) in ethylene oligomerization. In addition, C₈-C₁₂ olefins occupied an important proportion in the products of oligomers. Under the conditions of 4.0 MPa, 25℃ and Al/Ni molar ratio of 275, the catalytic selectivity of A/MAO system toward C₈-C₁₂ was about 30.1%(mass fraction), and the content of C₈-C₁₂ α-olefins was consistently above 70%. Furthermore, besides the ligand environment, the catalytic properties of A-C were substantially affected by experimental parameters, such as the reaction pressure, reaction temperature and Al/Ni ratio.

Key words: Salicylaldehyde-imine ligand, Nickel complex, Ethylene oligomerization, C₈-C₁₂ olefin

CHEN Liduo, HUO Hongliang, WANG Libo, MA Lili, JIANG Yan, XIE Junyi, WANG Jun. Nickel Complexes Based on Salicylaldehyde-imine Ligands: Synthesis, Characterization and Catalytic Oligomerization of Ethylene[J]. Chemical Research in Chinese Universities, 2018, 34(6): 945-951.

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Nickel Complexes Based on Salicylaldehyde-imine Ligands: Synthesis, Characterization and Catalytic Oligomerization of Ethylene

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