The effects of samarium (Sin) on carbon-methanation and catalytic activity of the Ba-Ru-K/AC (active carbon) catalyst for ammonia synthesis were investigated.The addition of samarium improved significantly the activity and stability of the catalyst.The results of temperature-programmed desorption (H2-TPD) and in-situ-TPSR FTIR indicated that samarium impeded the adsorption of hydrogen on the catalyst surface,thus leading to the high catalytic activity and resistance to carbon-methanation.XRD patterns reveal that the promoter samarium was in the form of both samarium oxide and carbonide (Sm2C1-x).The formation of Sm2C1-x was probably due to the interaction of samarium with the unsaturated bond of carbon on the surface of active carbon,and thus hindered the carbon-methanation.
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