Critical Influence of Nanofaceting on the Preparation and Performance of Supported Gold Catalysts

TINOCO, MIGUEL; FERNÁNDEZ GARCÍA, SUSANA; LÓPEZ-HARO, MIGUEL; HUNGRÍA, ANA B.; CHEN, XIAOWEI; BLANCO, GINESA; PÉREZ OMIL, JOSE A.; COLLINS, SEBASTIÁN E.; OKUNO, HANAKO; CALVINO, JOSE J.

ACS Catalysis

American Chemical Society

Año: 2015 vol. 5 p. 3504 - 3513

2155-5435

A partial transformation of the {100} surfaces ofceria nanocubes into a set of nanometer-heighted, {111}-bounded, peaks was achieved by an oxidation treatment at 600°C. This particular type of surface nanostructuration allows thepreparation of CeO2 nanoparticles in which {111} nanofacetscontribute significantly to their surface crystallography. Thistransformation of the surface structure plays a key influence onthe behavior of ceria as a support of gold catalysts. Thus, theappearance of well-developed {111}-nanofacets leads to a muchhigher efficiency in the usage of this noble metal in the synthesisof catalysts when prepared by the deposition−precipitationmethod. Moreover, gold catalysts supported on the surfacereconstructedoxide present an intrinsic (per gold surface atom)CO oxidation activity much higher