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Abstract: A series of Ru/Sm2O3–CeO2 catalysts were prepared by using a co-precipitation (CP) method and characterized by XRD, BET, SEM, H2-TPD-MS, H2-TPR and CO chemisorption. The activity test shows that ammonia concentration of the catalyst with 7% Sm is 13.4% at 10MPa, 10,000h−1, 425°C, which is 21% higher than that of Ru/CeO2. Such high catalytic activity was due to three effects: the morphology changes of catalyst, electrodonating property of partially reduced CeO2−x to Ru metal and the property of easily hydrogen desorption derived from the presence of Sm3+ in ceria. [Copyright &y& Elsevier]

Abstract: Ru/MgO–CeO2 catalysts were prepared by using co-precipitation (CP), deposition precipitation (DP) and modified deposition precipitation (MDP) methods. These samples were characterized by XRD, N2 physisorption, H2-TPD, N2-TPD, H2-TPR and CO chemisorption. It is found that the catalytic activity of Ru/MgO–CeO2 prepared by MDP method was 2.5 times higher than that of the catalyst prepared with the DP route under the same reaction conditions. The activity of the catalyst with MDP method was also higher than that of Ru/MgO–CeO2 synthesized by CP method. The possible influence factors of preparation methods on the catalytic performance were proposed based on the experimental results. [ABSTRACT FROM AUTHOR]