Physicochemical characterization of Au/CeO2 solid. Part 1: The deposition–precipitation preparation method

Catalytic Oxidation of Propylene, Toluene, Carbon Monoxide, and Carbon Black over Au/CeO2Solids: Comparing the Impregnation and the Deposition-Precipitation Methods

“…The solids obtained using the two different preparation methods have been separately characterized in a previous work [21, 22]. The specific surface areas of the impregnated solids (Imp) were smaller compared to those obtained for the solids prepared by the deposition-precipitation (DP) method.…”

“…On the other hand, only nanoparticles with an average diameter estimated to be equal to 3.9 nm have been detected on the DP-solids. The presence of large particles in the Imp-solids and its absence in the DP-solids were confirmed using the X-ray diffraction technique [21, 22]. …”

“…The small amount of Au + that was still present after calcination under dry air I attributed to gold species located in the proximity of O 2− and/or Cl − ions present in the CeO 2 support. Since elementary analysis showed that the number of Cl present in the DP-solids is negligible compared to that present in the Imp-solids, therefore the ions surrounding the Au + species in both solids types are more likely to be O 2− [21, 22]. …”

Physicochemical characterization of Au/CeO2 solids. Part 2: The impregnation preparation method

“…Cerium oxide CeO 2 was prepared as explained elsewhere [17]. Gold-based solids, named xAu/CeO 2 (where x is the gold weight percent in the calcined solid, 0…”

“…Most of the techniques used to characterize the prepared samples (ICP/AES; DSC/TG; BET; DR-UV/vis; TEM; SEM; XPS; TPR; EPR) were described in details in part 1 of this work [17] and experiments were done under the same conditions. X-ray diffraction (XRD) analysis was performed on a BRUKER Advance D8 powder X-ray diffractometer using Cu Ka radiation (l ¼ 0.15, 406 nm).…”