Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (8): 892-899.DOI: 10.11944/j.issn.1000-0518.2015.08.140456

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Polymer Microgel-Supported Ni Catalysts and Their Catalytic Reduction of Aromatic Nitro Compounds

CAI Haokunab,ZHANG Jianb,LU Pingb,LEI Keweia,DONG Jianb*()   

  1. aSchool of Material Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China
    bSchool of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China
  • Received:2014-12-31 Accepted:2015-05-06 Published:2015-08-08 Online:2015-08-08
  • Contact: DONG Jian
  • Supported by:
    Supported by Department of Science and Technology, Zhejiang Province(No.2012C24003), Natural Science Foundation of Zhejiang Province(No;LY12E03001)

Abstract:

Polymer microgel-supported Ni particles were prepared by impregnation first with a small amount of Ni seeds on microgels, then by electroless nickel plating on the seeded microgels. The nickel particles exhibit good catalytic activity in hydrogen transfer reactions of aromatic nitro compounds with hydrazine hydrate as the hydrogen donor. Dynamic light scattering characterization shows that Ni embedded gel particles have hydrodynamic diameters of approximately 411.9 nm. Results from high resolution transmission electron microscopy and X-ray photoelectron spectroscopy demonstrate that Ni is mainly in the form of NiO. The effect of the hydrazine hydrate amount on the reaction was examined for the reduction of nitrobenzene. The result show that a molar ratio of 1:15 for the substrate to hydrazine hydrate is optimal for the reduction. The optimized conditions are used for reduction of a series of aromatic nitro compounds, giving rise to high yields of aromatic amines. Kinetic analysis shows that the Arrhenius activation energy is 133.7 kJ/mol, the enthalpy is 130.9 kJ/mol, and the entropy is 102.8 J/(mol·K).

 

Key words: polymer microgel, nickel, hydrazine hydrate, aromatic nitro compounds, catalysis

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