Abstract
In this study, hierarchical porous structured CeO2/Al2O3 monolith was prepared through the combination of sol-gel and heating-drying-calcination methods. Subsequently, the Au-CeO2/Al2O3 monoliths of different Au loadings were prepared by the deposition-precipitation method. When the Au3.2%-CeO2/Al2O3 monolith was used for low- temperature CO oxidation, compared with Au3.2%-CeO2/Al2O3 powder particles, excellent activity (temperature of 34 °C for complete conversion) and stability (up to 100 h) for the CO oxidation were achieved. Such an excellent performance was attributed to the unique hierarchical porous structure of monolith, the good oxygen storage capacity of CeO2, as well as the excellent CO adsorption and catalytic properties of the monodisperse Au nanoparticles.
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