Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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The Influence of a Second Metal on the Ni/SiC Catalyst for the Methanation of Syngas

  • Song, Lanlan (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry) ;
  • Yu, Yue (Lin Yi Academy of Technology Cooperation and Application) ;
  • Wang, Xiaoxiao (Taiyuan University of Science and Technology) ;
  • Jin, Guoqiang (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry) ;
  • Wang, Yingyong (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry) ;
  • Guo, XiangYun (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry)
  • Received : 2014.02.26
  • Accepted : 2014.04.02
  • Published : 2014.10.01
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Abstract

The catalytic performance of silicon carbide supported nickel catalysts modified with or without second metal (Co, Cu and Zn) for the methanation of CO has been investigated in a fixed-bed reactor using a feed consisting of 25% CO and 75% $H_2$ without any diluent gas. It has been found that the introduction of Co species can clearly improve the catalytic activity of Ni/SiC catalyst, whereas the addition of Cu or Zn can result in a significant decrease in the catalytic activity. The characterizations by means of XRD, TEM, XPS, CO-TPD and $H_2$-TPR indicate that the addition of Co could decrease the particle size of active metal, increase active sites on the surface of methanation catalyst, improve the chemisorption of CO and enhance the reducibility of methanation catalysts. Additionally, the special interaction between Co species and Ni species is likely favorable for the dissociation of adsorbed CO on the surface of catalyst, and this may also contribute to the high activity of 5Co-Ni/SiC catalyst for CO methanation reaction. For 5Cu-Ni/SiC catalyst and 5Zn-Ni/SiC catalyst, Cu and Zn species could cover partial nickel particles and decrease the chemisorption amount of CO. These could be responsible for the low methanation activity. In addition, a 150h stability test under 2 MPa and $300^{\circ}C$ showed that 5Co-Ni/SiC catalyst was very stable for CO methanation reaction.

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References

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