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Synthesis, characterization, and ethylene oligomerization of three novel dendritic nickel catalysts

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Abstract

Three dendritic nickel complexes C1–C3 were synthesized from three poly(amido amine) dendrimers, salicylic aldehyde and nickel chloride hexahydrate via Schiff base condensation reaction and coordination reaction. The structures of the dendritic ligands and nickel complexes were characterized by FT-IR, UV, 1H NMR, ESI–MS, and elemental analysis. When activated with aluminum co-catalysts, three complexes C1–C3 were able to catalyze ethylene oligomerization. The catalytic activities and the product distribution of complexes C1–C3 were depended on the reaction parameter, co-catalyst, solvent, and the structure of the pre-catalyst. When using ethyl aluminum sesquichloride (EASC) as co-catalyst in toluene, the catalytic activity of complex C3 containing the longest bridging methylene groups reached the highest value of 1.63 × 106 g·(mol Ni·h)−1 with 69.15% C11 in the product at 30 min, 25 °C, 0.5 MPa, and Al/Ni ratio of 900.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 21576048), Innovation Fund of Petro-China (No. 2014D-5006-0503) and the University of Jilin.

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Authors and Affiliations

  1. Key Laboratory of Oil Gas and Chemical Technology, College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, 163318, Heilongjiang, China

    Jun Wang & Cui-Qin Li

  2. Daqing Chemical Research Center of Petrochina Petrochemical Research Institute, Daqing, 163714, Heilongjiang, China

    Li-Li Ma, Lei Song, Si-Han Wang & Hong-Liang Huo

Authors
  1. Jun Wang
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  2. Li-Li Ma
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  3. Lei Song
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  4. Si-Han Wang
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  6. Cui-Qin Li
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Correspondence to Cui-Qin Li.

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Wang, J., Ma, LL., Song, L. et al. Synthesis, characterization, and ethylene oligomerization of three novel dendritic nickel catalysts. Chem. Pap. 71, 895–904 (2017). https://doi.org/10.1007/s11696-016-0009-3

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