Facet-dependent anchoring of gold nanoparticles on TiO2 for CO oxidation

The interfacial perimeter of gold nanocatalysts is popularly viewed as the active sites for a number of chemical reactions, while the geometrical structure of the interface at atomic scale is less known. Here, TiO2-nanosheets and nanospindles were adapted to accommodate Au particles (∼2.2 nm), formi...

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Bibliographic Details
Published in:Chinese journal of catalysis 2019-10, Vol.40 (10), p.1534-1539
Main Authors: Shao, Bin, Zhao, Wenning, Miao, Shu, Huang, Jiahui, Wang, Lili, Li, Gao, Shen, Wenjie
Format: Article
Language:English
Subjects:
Au nanoparticles
CO oxidation
Interfacial perimeter
Stability
Titanium dioxide
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Summary:The interfacial perimeter of gold nanocatalysts is popularly viewed as the active sites for a number of chemical reactions, while the geometrical structure of the interface at atomic scale is less known. Here, TiO2-nanosheets and nanospindles were adapted to accommodate Au particles (∼2.2 nm), forming Au-TiO2{001} and Au-TiO2{101} interfaces. Upon calcination at 623 K in air, HAADF-STEM images evidenced that the Au particles on TiO2{101} enlarged to 3.1 nm and these on TiO2{001} remained unchanged, suggesting the stronger metal-support interaction on TiO2{001}. Au/TiO2{001} was more active for CO oxidation than Au/TiO2{101} system. Two different Au/TiO2 catalysts, prepared via colloid-immobilized method, showed significant morphological effect in CO oxidation. The TiO2{001} can well stabilize the 2–3 nm Au nanoparticles and exhibit higher catalytic activity in CO oxidation.
ISSN:1872-2067
1872-2067
DOI:10.1016/S1872-2067(19)63388-7