Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (5): 563-571.DOI: 10.11944/j.issn.1000-0518.2017.05.160306

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Synthesis of Schiff Base Catalyzed by Coal-based Solid Acid Catalyst

WU Zhiqianga,XU Zeyanga,BI Shuxiana,ZHAN Haijuana,MA Baojunb,LIU Wanyia*()   

  1. aCollege of Chemistry and Chemical Engineering
    bKey Laboratory and Energy Sources & Engineering,Ningxia University,Yinchuan,750021,China;
  • Received:2016-08-04 Accepted:2016-11-04 Published:2017-05-02 Online:2017-05-02
  • Contact: LIU Wanyi
  • Supported by:
    Supported by the Natural Science Foundation of China(No.21166021, No.51364038), Graduate Innovative Project of Ningxia University(No.GIP201642)

Abstract:

A coal-based solid acid catalyst AC@PANI-SO3H(APS) was prepared in situ by solution polymerization using coal-based activated carbon(AC) and aniline(ANI) as raw materials. The catalyst was characterized by scanning elecrton microscopy(SEM), Fourier transform infrared spectrometer(FTIR), X-ray photoelectron spectroscopy(XPS), and thermal gravimetric analyzer(TGA). Its catalytic activity on yield of Schiff bases was studied under microwave irradiation. The results show that with 5 %(based on the amount of o-phenylenediamine per mole) catalyst, the reaction in ethanol is performed for 3 to 20 min, the yield of Schiff-bases is 80% to 93%. It is proved that the catalyst exhibits good catalytic activity in the microwave-catalyzed synthesis of Schiff base. The reaction time is short, the process is simple to operate, and the catalyst can be reused 5 times. The main reason for the decrease of the activity of the catalyst after repeated 5 times is that the sulfonic acid functional groups bonded to the solid acid surface is disappeared and the activity is decreased.

Key words: coal, solid acid, schiff-base synthesis, microwave radiation, process optimization