Abstract
In the present work, the preparation of Au/In2O3−TiO2 catalysts with loadings of 1, 6, and 12 wt % of In is reported. In2O3−TiO2 supports prepared by the sol−gel method allow the formation of solids with high specific surface area. By means of the urea deposition−precipitation method, gold nanoparticles in the range of 2.4−3.6 nm were obtained on the supported gold catalysts. Catalysts tested in the CO oxidation showed a very high activity at the subambient reaction temperature (0 °C). The indium oxide catalysts (6 and 12 wt % of In) are more active than the Au/TiO2 parent catalyst. Full conversion was achieved at temperatures lower than 150 °C on the Au/In−TiO2 (6 wt % of In). It is shown that under reaction conditions, the Au/In−TiO2 catalysts are more stable than the Au/TiO2 parent catalyst. This behavior is related to the strong anchoring of the gold particles on the well-dispersed indium oxide and on the structural defects of the support caused by the doping with In of the anatase support.
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