Contributions of distinct gold species to catalytic reactivity for carbon monoxide oxidation
Li-Wen Guo,Pei-Pei Du,Xin-Pu Fu,Chao Ma,Jie Zeng,Rui Si,Yu-Ying Huang,Chun-Jiang Jia,Ya-Wen Zhang,Chun-Hua Yan +9 more
TLDR
It is found that the metallic gold component in clusters or particles plays a much more critical role as the active site than the cationic single-atom gold species for the room-temperature carbon monoxide oxidation reaction.Abstract:
Small-size (<5 nm) gold nanostructures supported on reducible metal oxides have been widely investigated because of the unique catalytic properties they exhibit in diverse redox reactions. However, arguments about the nature of the gold active site have continued for two decades, due to the lack of comparable catalyst systems with specific gold species, as well as the scarcity of direct experimental evidence for the reaction mechanism under realistic working conditions. Here we report the determination of the contribution of single atoms, clusters and particles to the oxidation of carbon monoxide at room temperature, by the aid of in situ X-ray absorption fine structure analysis and in situ diffuse reflectance infrared Fourier transform spectroscopy. We find that the metallic gold component in clusters or particles plays a much more critical role as the active site than the cationic single-atom gold species for the room-temperature carbon monoxide oxidation reaction. Nanoscale supported gold clusters are common redox catalysts but in many cases the nature of the active sites remains unclear. Here, the authors use X-ray absorption to determine the contribution of single gold atoms, clusters and particles on the reactivity of room-temperature carbon monoxide oxidation.read more
Citations
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References
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Onset of Catalytic Activity of Gold Clusters on Titania with the Appearance of Nonmetallic Properties
Mika Valden,X. Lai,D. W. Goodman +2 more
TL;DR: Results suggest that supported clusters, in general, may have unusual catalytic properties as one dimension of the cluster becomes smaller than three atomic spacings.
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TL;DR: In this paper, gold catalysts were prepared by coprecipitation from an aqueous solution of HAuCl4 and the nitrates of various transition metals, including Auα-Fe2O3, AuCo3O4, and AuNiO.
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Novel Gold Catalysts for the Oxidation of Carbon Monoxide at a Temperature far Below 0 °C
TL;DR: In this article, a variety of gold catalysts are used to catalyze the oxidation of carbon monoxide at temperatures as low as −70 °C and are stable in a moistened gas atmosphere.
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Active Nonmetallic Au and Pt Species on Ceria-Based Water-Gas Shift Catalysts
TL;DR: It is reported here that for the class of nanostructured gold– or platinum–cerium oxide catalysts, which are active for the water-gas shift reaction, metal nanoparticles do not participate in the reaction.
Journal ArticleDOI
Identification of Active Gold Nanoclusters on Iron Oxide Supports for CO Oxidation
Andrew A. Herzing,Christopher J. Kiely,Albert Frederick Carley,Philip Landon,Graham J. Hutchings +4 more
TL;DR: High catalytic activity for carbon monoxide oxidation is correlated with the presence of bilayer clusters that are ∼0.5 nanometer in diameter and contain only ∼10 gold atoms, consistent with that demonstrated previously with the use of model catalyst systems.