Back to Search
Start Over
Surface Density Dependent Catalytic Activity of Single Palladium Atoms Supported on Ceria*.
- Source :
-
Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2021 Oct 11; Vol. 60 (42), pp. 22769-22775. Date of Electronic Publication: 2021 Jul 20. - Publication Year :
- 2021
-
Abstract
- The analogy between single-atom catalysts (SACs) and molecular catalysts predicts that the specific catalytic activity of these systems is constant. We provide evidence that this prediction is not necessarily true. As a case in point, we show that the specific activity over ceria-supported single Pd atoms linearly increases with metal atom density, originating from the cumulative enhancement of CeO <subscript>2</subscript> reducibility. The long-range electrostatic footprints (≈1.5 nm) around each Pd site overlap with each other as surface Pd density increases, resulting in an observed deviation from constant specific activity. These cooperative effects exhaust previously active O atoms above a certain Pd density, leading to their permanent removal and a consequent drop in reaction rate. The findings of our combined experimental and computational study show that the specific catalytic activity of reducible oxide-supported single-atom catalysts can be tuned by varying the surface density of single metal atoms.<br /> (© 2021 Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-3773
- Volume :
- 60
- Issue :
- 42
- Database :
- MEDLINE
- Journal :
- Angewandte Chemie (International ed. in English)
- Publication Type :
- Academic Journal
- Accession number :
- 34180114
- Full Text :
- https://doi.org/10.1002/anie.202105750