| Autor: |
López-Rodríguez, Sergio, Davó-Quiñonero, Arantxa, Bailón-García, Esther, Lozano-Castelló, Dolores, Villar, Ignacio, Dieste, Virginia Perez, Calvo, Jon Ander Onrubia, Velasco, Juan Ramón González, Bueno-López, Agustín |
| Zdroj: |
Journal of CO2 Utilization; 20220101, Issue: Preprints |
| Abstrakt: |
Ni/CeO2catalysts are very active and selective for total hydrogenation of CO2to methane, but the nature of the active sites is still unclear. The surface of a Ni/CeO2catalyst has been monitored under CO2methanation conditions by Near Ambient Pressure-XPS (NAP-XPS) using synchrotron radiation, and has been concluded that the species involved in the redox processes taking place during the CO2methanation mechanism are the Ni2+-CeO2/Ni0and Ce4+/Ce3+pairs. In addition, a small fraction of nickel is present on the catalyst surface forming NiO and Ni2+-carbonates/hydroxyls (around 20% of the total surface nickel), but these species do not participate in the redox processes of the methanation mechanism. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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