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The effects of samarium(Sm) 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.
The effects of samarium (Sm) 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 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 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