摘要：Iron oxide supported Au nanomaterials are one of the most studied catalysts for low-temperature CO *** performance not only critically depends on the size of the supported Au nanoparticles(NPs)but also strongly on the chemical nature of the iron *** this study,Au NPs supported on iron oxide nanorods with different surface properties throughβ-FeOOH annealing,at varying temperatures,were synthesized,and applied in the CO *** characterizations of the interactions between Au NPs and iron oxides were obtained by X-ray diffraction,transmission electron microscopy(TEM),and X-ray photoelectron *** results indicate that the surface hydroxyl group on the Au/FeOOH catalyst,before calcination(Au/FeOOH-fresh),could facilitate the oxygen adsorption and dissociation on positively charged Au,thereby contributing to the low-temperature CO oxidation *** calcination at 200℃,under air exposure,the chemical state of the supported Au NP on varied iron oxides partly changed from metal cation to Au0,along with the disappearance of the surface OH ***/FeOOH with the highest Au0 content exhibits the highest activity in CO oxidation,among the as-synthesized ***,good durability in CO oxidation was achieved over the Au/FeOOH catalyst for 12 h without observable *** addition,the advanced identical-location TEM method was applied to the gas phase reaction to probe the structure evolution of the Au/iron oxide series of the catalysts and support structure.A Au NP size-dependent Ostwald ripening process mediated by the transport of Au(CO)x mobile species under certain reaction conditions is proposed,which offers a new insight into the validity of the structure-performance relationship.