CO Oxidation Activity of a Au/Ceria-Zirconia Catalyst Prepared by Deposition-Precipitation with Urea

ELOY DEL RIO; GINESA BLANCO; SEBASTIAN COLLINS; MIGUEL LOPEZ-HARO; XIAOWEI CHEN; JUAN JOSÉ DELGADO; JOSÉ CALVINO; SERAFIN BERNAL

TOPICS IN CATALYSIS

SPRINGER/PLENUM PUBLISHERS

Lugar: New York; Año: 2011 vol. 54 p. 931 - 940

1022-5528

The activation of a 2.6 wt% Au/Ce0.62Zr0.38O2 catalyst prepared by deposition–precipitation 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).