Resolving the puzzle of single-atom silver dispersion on nanosized γ-Al2O3 surface for high catalytic performance
Ag/γ-Al 2 O 3 is widely used for catalyzing various reactions, and its performance depends on the valence state, morphology and dispersion of Ag species. However, detailed anchoring mechanism of Ag species on γ-Al 2 O 3 remains largely unknown. Herein, we reveal that the terminal hydroxyls on γ-Al 2...
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| Veröffentlicht in: | Nature communications Jg. 11; H. 1; S. 529 - 9 |
|---|---|
| Hauptverfasser: | , , , , , , , |
| Format: | Journal Article |
| Sprache: | Englisch |
| Veröffentlicht: |
London
Nature Publishing Group UK
27.01.2020
Nature Publishing Group Nature Portfolio |
| Schlagworte: | |
| ISSN: | 2041-1723, 2041-1723 |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | Ag/γ-Al
2
O
3
is widely used for catalyzing various reactions, and its performance depends on the valence state, morphology and dispersion of Ag species. However, detailed anchoring mechanism of Ag species on γ-Al
2
O
3
remains largely unknown. Herein, we reveal that the terminal hydroxyls on γ-Al
2
O
3
are responsible for anchoring Ag species. The abundant terminal hydroxyls existed on nanosized γ-Al
2
O
3
can lead to single-atom silver dispersion, thereby resulting in markedly enhanced performance than the Ag cluster on microsized γ-Al
2
O
3
. Density-functional-theory calculations confirm that Ag atom is mainly anchored by the terminal hydroxyls on (100) surface, forming a staple-like local structure with each Ag atom bonded with two or three terminal hydroxyls. Our finding resolves the puzzle on why the single-atom silver dispersion can be spontaneously achieved only on nanosized γ-Al
2
O
3
, but not on microsized γ-Al
2
O
3
. The obtained insight into the Ag species dispersion will benefit future design of more efficient supported Ag catalysts.
Detailed atom-level anchoring mechanism of Ag species on γ-Al
2
O
3
is largely unknown for the widely used Ag/γ-Al
2
O
3
catalyst. Here, the authors demonstrate that single-Ag atom can be only anchored by the terminal hydroxyls on the (100) surfaces of γ-Al
2
O
3
through consuming two or three terminal hydroxyls. |
|---|---|
| Bibliographie: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 |
| ISSN: | 2041-1723 2041-1723 |
| DOI: | 10.1038/s41467-019-13937-1 |