Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (6): 20220778.doi: 10.7503/cjcu20220778

• Physical Chemistry • Previous Articles     Next Articles

Preparation and Catalytic Behavior in Ethylene Oligomerization of Nickel Catalyst Supported by Dendritic PAMAM Functionalized Nano-silica

HUANG Jin1,2, GUO Lijun2, LI Feng2, LI Yang2, LI Cuiqin2()   

  1. 1.Heilongjiang Provincial Key Laboratory of Oilfield Applied Chemistry and Technology,Daqing Normal University,Daqing 163712,China
    2.Heilongjiang Provincial Key Laboratory of Polyolefin New Materials,College of Chemistry & Chemical Engineering,Northeast Petroleum University,Daqing 163318,China
  • Received:2022-12-31 Online:2023-06-10 Published:2023-02-17
  • Contact: LI Cuiqin E-mail:dqpilicuiqin@126.com
  • Supported by:
    the Heilongjiang Key Research and Development Project, China(JD22A026);the Heilongjiang Province Natural Science Foundation, China(E2018012)

Abstract:

Nano-silica supported nickel catalyst(compound G) with good catalytic activity and reusability was prepared through anchoring via covalent binding of dendritic poly(amido amine)(PAMAM) in nano-silica. The composition and the morphology of compound G were verified by elemental analysis, Fourier transform infrared spectrophotometer(FTIR), inductively coupled plasma(ICP), X-ray diffraction(XRD) and scanning electron microscopy(SEM). The catalytic behavior of compound G in ethylene oligomerization was evaluated and the effect of oligomerization parameters on the catalytic properties of compound G was investigated. The results showed that compound G had good catalytic properties and repeatability. Based on the grey correlation analysis, it was found that the reaction pressure was the most important factor affecting the activity of ethylene oligomerization, and the reaction temperature was the most important factor affecting the selectivity of ethylene oligomerization. When the methylaluminoxane(MAO) was cocatalyst, the dosage of compound G was 5 μmol, the molar ratio of Al/Ni was 500, reaction pressure was 0.7 MPa, reaction time was 30 min and reaction temperature was 35 ℃, the catalytic activity was 3.85×105 g/(mol Ni·h) and the selectivity of C4—C8 olefins was 94.98%. The nickel content, the catalytic activity and the selectivity of C8 olefin for compound G were higher than nickel catalyst supported by amino modified nano-silica (compound E) due to dendritic effect. And the catalytic activity of compound G was 3.12×105 g/(mol Ni·h) and the selectivity of C8 olefin was 36.37% after the third oligomerization reaction.

Key words: Dendritic poly(amido amine), Ethylene oligomerization, Dendritic effect, Heterogeneous catalyst

CLC Number: 

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