Chemical Research in Chinese Universities ›› 2018, Vol. 34 ›› Issue (4): 635-642.doi: 10.1007/s40242-018-7381-1

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Preparation and Characterization of SiO2/Co and C/Co Nanocomposites as Fisher-Tropsch Catalysts for CO2 Hydrogenation

HAN Fuqin1, ZHANG Zhe1, NIU Na2, LI Jian1   

  1. 1. College of Science, Northeast Forestry University, Harbin 150040, P. R. China;
    2. Key Laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin 150040, P. R. China
  • Received:2017-11-28 Online:2018-08-01 Published:2018-06-11
  • Contact: NIU Na E-mail:niuna@nefu.edu.cn
  • Supported by:
    Supported by the Natural Science Foundation of Heilongjiang Province, China(No.B20170001), the Postdoctoral Fund of Heilongjiang Province, China(No.LBH-Z16009), the Fundamental Research Funds for the Central Universities, China(No. 2572018BC28) and the Postdoctoral Science Foundation of China(Nos.2016M591501, 2017T100218).

Abstract: To fabricate high-density cobalt-based catalysts, we first synthesized SiO2/C composites via a hydrothermal method and removed C and SiO2 by two different methods, respectively. The as-prepared SiO2 and C supports then reacted with cobalt acetylacetonate and N,N-dimethylformamide(DMF) under hydrothermal conditions to prepare SiO2/Co and C/Co nanocomposite catalysts. The catalysts were characterized by X-ray diffraction(XRD), scanning electron microscope(SEM), transmission electron microscopy(TEM), inductively coupled plasma mass spectrometry(ICP), energy dispersive X-ray fluoresence spectrometer(EDX), and nitrogen adsorption. It was found that hexagonal cobalt nanocrystals were successfully integrated with the mesoporous silica or carbon nanotube supports. SEM and TEM results show that SiO2/Co composites with a hollow/mesoporous sphere structure and C/Co composites with a tubular structure have been successfully synthesized. Both composite samples show superparamagnetism exhibiting an S-type hysteresis loop, which originated from the cobalt nanoparticles in the samples. Nitrogen adsorption/desorption curves suggest that the SiO2 and C supports have well-developed pore structures and large specific surface areas, and the loading and good dispersity of cobalt nanoparticles on the supports were proven by ICP and EDX. Moreover, the samples exhibited good and stable catalytic activity, demonstrating that the two composites are suitable catalysts for Fischer-Tropsch CO2 hydrogenation.

Key words: Mesoporous SiO2, Carbon nanotube, Cobalt based catalyst, Fischer-Tropsch reaction, CO2 hydrogenation