| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 65979 | Journal of Molecular Catalysis A: Chemical | 2013 | 5 Pages |
A series of Ag–Ru/CeO2 catalysts were prepared by conventional impregnation methods and characterized by XRD, BET, XPS, H2-TPR, H2-TPD-MS, and N2-TPD. The activity test shows that ammonia concentration of the catalyst with 6% Ag is 9.4% at 10 MPa, 10,000 h−1, 400 °C, which is 22% higher than that of Ru/CeO2. Such high catalytic activity was ascribed to three effects: electron donating property of partially reduced CeO2−x to Ru metal, the low workfunction of Ru atoms and the less competitive adsorbed between hydrogen and nitrogen on Ru atoms derived from the synergetic effect between Ag and Ru.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (155 K)Download as PowerPoint slideHighlights► Silver is a very efficient promoter for Ru/CeO2 catalyst in ammonia synthesis. ► Silver can improve the reduction profiles of ceria by enhance the SMSI effect. ► Silver can weaken the competition of hydrogen and nitrogen adsorbed on Ru surface. ► The work function of Ru metal was decreased by silver loading.
