6533b7dafe1ef96bd126ea63

RESEARCH PRODUCT

Au deposited on CeO2 prepared by a nanocasting route: A high activity catalyst for CO oxidation

Tomás GarcíaRaul ArenalAlvaro MayoralBegoña PuértolasBenjamín SolsonaJosé Manuel LópezStuart Hamilton Taylor

subject

Inorganic chemistryNanoparticleCatalytic combustionCatalysisCatalysislaw.inventionchemistry.chemical_compoundchemistryColloidal goldlawOxidation stateCalcinationPhysical and Theoretical ChemistryDispersion (chemistry)Carbon monoxide

description

Abstract A set of catalysts comprised of gold on different CeO 2 supports has been prepared by a nanocasting route and characterized by several physicochemical techniques. These catalysts have been tested for CO oxidation and show outstanding catalytic activity. Higher calcination temperatures of the hard template, producing a poorly ordered silica template, have led to a higher amount of oxygen vacancies on the surface of CeO 2 . The presence of surface oxygen defects in the support combined with the deposition of Au nanoparticles ( ca. 3 nm) homogeneously dispersed on the CeO 2 support may explain the excellent behaviour for low temperature CO oxidation. Surprisingly, it has been observed that the degree of inverse replication of the template is not relevant in the catalytic performance, as in all cases neither the characteristics of the ceria surface nor the dispersion and oxidation state of gold are greatly modified by the formation of inter-particle bridges.

yearjournalcountryeditionlanguage
2014-08-01Journal of Catalysis
https://doi.org/10.1016/j.jcat.2014.06.021