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Novel dendrimer-based nickel catalyst: synthesis, characterization and performance in ethylene oligomerization

Jun Wang, Guang Yang, Cui-Qin Li, Wei-Guang Shi, and Si-Han Wang

Key Laboratory of Oil Gas & Chemical Technology, College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing, China

 

E-mail: wangjun1965@yeah.net

Abstract: A novel nickel metallodendrimer was synthesized with poly(amidoamine), 3,5-di-tert-butyl-2-hydroxy-benzaldehyde and nickel chloride via the Schiff’s base and the complexation reactions. Structures of the dendritic ligand and its nickel complex were characterized by IR, NMR, UV, ESI-MS and elemental analyses. This new nickel metallodendrimer as a catalyst precursor, together with methylaluminoxane as an activator, was evaluated in the ethylene oligomerization. Under the conditions of 0.5 h, 0.5 MPa, 25°C and Al/Ni mole ratio 500: 1 employed for the nickel complex, the catalytic activity showed a maximum value of 4.93 × 105 grams per mole of Ni catalyst per hour. Substituents on the benzene ring seem to have a negative influence on the catalytic activity of the complex.

Keywords: nickel complex – dendrimer – catalyst – ethylene oligomerization

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-014-0603-1

 

Chemical Papers 68 (11) 1532–1538 (2014)

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