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Title: Physicochemical characterization of Au/CeO2 solid. Part 1: the deposition–precipitation preparation method
Authors: Aboukaïs, Antoine
Aouad, Samer 
Ayadi, Houda El
Skaf, Mira
Labaki, Madona
Cousin, Renaud
Abi Aad, Edmond
Affiliations: Department of Chemistry 
Keywords: Adsorption
Electron microscopy
Electron resonance
Issue Date: 2012
Part of: Materials chemistry and physics
Volume: 137
Issue: 1
Start page: 34
End page: 41
Au/CeO2 (4 wt.% gold) solid was prepared using the deposition–precipitation method. The deposition of gold on ceria did not affect its specific surface area (122 m2 g−1/400 °C). The average diameter of gold particles obtained was estimated to be equal to 3.9 nm. Moreover, 60% of the gold was in the form of nanoparticles with a size ranging between 3 and 4 nm. 80% of the gold in the nanoparticles was in the metallic form Au0 and 20% was present as Au+. These latter cations interact directly with the O2− anions of CeO2. When evacuated at 400 °C for 1 h, the cations were reduced into Au0. All the adsorptions were performed on solids treated under vacuum at 400 °C for 1 h. The adsorption of O2 at room temperature led to the formation of O2− species. The adsorption of 17O-enriched molecular oxygen demonstrated that the two oxygen atoms in O2− are equivalent. When CO was introduced, it reacted with the O2− of the support to give CO2−. When NO2, NO or N2O were added at room temperature, they decomposed to form adsorbed O2− species at the surface of the solid. Highlights ► Au/CeO2 solid prepared by the deposition–precipitation method presents highly dispersed Au nanoparticles. ► The adsorption on Au/CeO2 of NO, NO2, N2O and O2 leads to the formation of O2−. ► The adsorption of CO on Au/CeO2 leads to the formation of CO2−. ► The adsorption of 17O2 on Au/CeO2 shows that the two adsorbed oxygen are equivalent.
DOI: 10.1016/j.matchemphys.2012.07.022
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Chemistry

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