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Received February 26, 2014
Accepted April 2, 2014
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The Influence of a Second Metal on the Ni/SiC Catalyst for the Methanation of Syngas
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Taiyuan 030001, PR China, Korea 1Lin Yi Academy of Technology Cooperation and Application, Linyin 276000, PR China 2Taiyuan University of Science and Technology, Taiyuan 030024, PR China
Korean Chemical Engineering Research, October 2014, 52(5), 678-687(10), 10.9713/kcer.2014.52.5.678 Epub 1 October 2014
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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% H2 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 H2-TPR indicate that the addition of_x000D_
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_x000D_
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 ℃ showed that 5Co-Ni/SiC catalyst was very stable for CO methanation reaction.
Keywords
References
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Chen JL, Qiao YH, Li YD, Appl. Catal. A: Gen., 337(2), 148 (2008)
