Published Research - Department of Chemistry

 

ORCID IDs

http://orcid.org/0000-0002-4364-9956

http://orcid.org/0000-0001-7741-3733

http://orcid.org/0000-0003-4672-8585

Date of this Version

1-27-2020

Citation

The Author(s) 2020

Comments

(2020) 11:529 | https://doi.org/10.1038/s41467-019-13937-1 | www.nature.com/naturecommunications

Abstract

Ag/γ-Al2O3 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-Al2O3 remains largely unknown. Herein, we reveal that the terminal hydroxyls on γ-Al2O3 are responsible for anchoring Ag species. The abundant terminal hydroxyls existed on nanosized γ-Al2O3 can lead to single-atom silver dispersion, thereby resulting in markedly enhanced performance than the Ag cluster on microsized γ-Al2O3. 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-Al2O3, but not on microsized γ-Al2O3. The obtained insight into the Ag species dispersion will benefit future design of more efficient supported Ag catalysts. https://doi.org/10.1038/s41467-019-13937-1 OPEN 1

Share

COinS