Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (11): 2646-2650.doi: 10.3866/PKU.WHXB20111129

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Effect of Preparation Methods on the Catalytic Activity of Ag-Ru/CeO2 Catalyst for Ammonia Synthesis

ZHANG Liu-Ming, LIN Jian-Xin, WANG Rong, WEI Ke-Mei   

  1. National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, P.R. China
  • Received:2011-06-11 Revised:2011-08-19 Published:2011-10-27
  • Contact: LIN Jian-Xin
  • Supported by:

    The project was supported by the Innovation Fund of China National Petroleum Corporation (2010D-5006-0502) and National Science and Technology Support Program of China (2007BAE08B02).

Abstract: Ag-Ru/CeO2 catalysts were prepared by co-precipitation (CP), modified deposition precipitation (MDP), and incipient-wetness impregnation (IP). The obtained catalysts were characterized by N2 physisorption, X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR), and temperatureprogrammed desorption of nitrogen (N2-TPD). The results showed that the ammonia synthesis activity of the Ag-Ru/CeO2 catalyst prepared by incipient-wetness impregnation was 9.4% at 10 MPa, 10000 h-1 and 400°C, which was higher than that obtained by other methods. There were obvious differences in the reduction property of Ru/CeO2 and in the nitrogen dissociation behavior among the catalysts prepared by different methods. Catalyst activity for the catalyst prepared by incipient-wetness impregnation improved greatly at a low reaction temperature. The high catalytic activity was due to the easier reduction of Ag-Ru/ CeO2 and the higher amount of dissociation of chemisorbed nitrogen.

Key words: Incipient-wetness impregnation, Ammonia synthesis, Silver, Ceria, Ru


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