Atomically Dispersed Dopants for Stabilizing Ceria Surface Area
| Autor: | Xavier Isidro Pereira-Hernández, Yong Wang, Carlos E. García-Vargas, Ryan Alcala, HH Hidde Brongersma, Andrew DeLaRiva, Jan Staněk, Angelica Benavidez, Jeffrey T. Miller, Dong Jiang, Abhaya K. Datye, Rik ter Veen, Eric J. Peterson |
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| Rok vydání: | 2021 |
| Předmět: |
Surface (mathematics)
Oxygen transfer Materials science Dopant Process Chemistry and Technology Hydrogen transfer 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences Metal Chemical engineering visual_art visual_art.visual_art_medium Dehydrogenation Thermal stability 0210 nano-technology General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental. 284:119722 |
| ISSN: | 0926-3373 |
| Popis: | Ceria is known to be a very good catalyst as well as a support for oxygen transfer (oxidation) as well as for hydrogen transfer (hydrogenation and dehydrogenation) reactions. Many of these reactions occur at high temperatures where ceria is known to sinter, leading to loss of surface area. The thermal stability of ceria can be improved by the addition of dopants, but the location of the dopant atoms and the mechanisms by which ceria stabilization occurs are poorly understood. We show here that dopants located on the surface of ceria are remarkably effective at stabilizing ceria surface area. Keeping metal loading constant at 0.88 mol%, we found that surface area of the ceria aged at 800 °C in air for 5 h ranged from 45 m2/g to 2 m2/g. Strongly bound dopants in atomically dispersed form help to pin surface sites and lower the mobility of ceria. |
| Databáze: | OpenAIRE |
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