Citation: ZHANG Liu-Ming, LIN Jian-Xin, WANG Rong, WEI Ke-Mei. Effect of Preparation Methods on the Catalytic Activity of Ag-Ru/CeO2 Catalyst for Ammonia Synthesis[J]. Acta Physico-Chimica Sinica, ;2011, 27(11): 2646-2650. doi: 10.3866/PKU.WHXB20111129
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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.
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Keywords:
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Incipient-wetness impregnation
, - Ammonia synthesis,
- Silver,
- Ceria,
- Ru
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