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|Title:||Physicochemical characterization of Au/CeO2 solid. Part 1 : The deposition–precipitation preparation method||Authors:||Aboukaïs, Antoine
Ayadi, Houda El
Abi Aad, Edmond
|Affiliations:||Department of Chemistry||Keywords:||Adsorption
|Issue Date:||2012||Part of:||Materials chemistry and physics||Volume:||137||Issue:||1||Start page:||34||End page:||41||Abstract:||
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.
|URI:||https://scholarhub.balamand.edu.lb/handle/uob/2396||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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