CO Oxidation Activity of a Au/Ceria-Zirconia Catalyst Prepared by Deposition�CPrecipitation with Urea |
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| Authors: | Eloy del R��o Ginesa Blanco Sebasti��n Collins Miguel L��pez Haro Xiaowei Chen Juan Jos�� Delgado Jos�� J Calvino Serafin Bernal |
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| Affiliation: | 1. Departamento de Ciencia de los Materiales e Ingenier??a Metal??rgica y Qu??mica Inorg??nica, Facultad de Ciencias, Universidad de C??diz, Campus R??o San Pedro, 11510, Puerto Real, C??diz, Spain
2. Instituto de Desarrollo Tecnol??gico para la Industria Qu??mica (INTEC), CONICET-UNL, G??emes 3450, S3000GLN, Santa Fe, Argentina
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| Abstract: | The activation of a 2.6 wt% Au/Ce0.62Zr0.38O2 catalyst prepared by deposition?Cprecipitation with urea is investigated. At 298 K, the activity for CO oxidation of the as-prepared sample is very low; it is significantly increased when heated at 418 K, under the reaction mixture, and much strongly when pre-treated under flowing O2(5%)/He, at 523 K. As revealed by XPS, FTIRS, HAADF-STEM, and HRTEM studies, the activation process consists of the transformation of the initial urea-containing Au(III) precursor deposited on the support into a highly dispersed metal phase (Au nano-particle mean size: 1.8 nm). |
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