Structural Analysis of Au/TiO₂Catalysts by Debye Function Analysis

Catalysts comprising between 1 and 3.6 wt% Au on TiO2have been studied by Debye function analysis. The structure of the deposited particles in Au/TiO2, prepared by deposition–precipitation, in the presence of magnesium citrate, was predominantly fcc cuboctahedral, with a size distribution between 3 and 4 nm. Optimized fits indicate a twin probability of ∼9%. Au/TiO2catalysts prepared by photodeposition were found to be much less active for CO oxidation than catalysts prepared by deposition–precipitation and comprised fcc cuboctahedral particles between 1 and 7 nm in size