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A supported ruthenium catalyst (Ru/Cs^+/CeO_2) for ammonia synthesis is described which incorporates a large amount of a Cs^+ promoter in a porous CeO_2 support to enhance the electron donation effect... of the alkali promoter on the ruthenium catalyst. Optimization of the Ru and Cs^+ promoter contents improves the ammonia synthesis rate to more than 4 times that of the benchmark catalyst (Cs^+/Ru/MgO) at 350 °C and 0.1 MPa, and the ammonia synthesis rate is stable for 100h. Introduction of the Cs^+ promoter into the support before the Ru impregnation increases the particle size of the Ru catalyst. Despite a decrease in the number of active sites, the TOF of the catalyst is more than 50 times that of Ru (2wt%)/CeO_2. CO adsorption measurements suggest an electron donating effect by the Cs^+ promoter to ruthenium metal. Reaction order analysis indicates this is due to a mitigation of hydrogen poisoning.続きを見る
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Mendeley出力
