Abstract
A comparative study on Au/TiO2catalysts prepared by impregnation with HAuCl4of commercial TiO2 or by impregnation of sol-gel derived TiO2has been carried out during CO oxidation. Specific surface areas and mean Au particle of 49 and 74 m2/g and 35 and 25 A were obtained for impregnated commercial TiO2 and sol-gel preparations, respectively. XRD patterns shown that in sol-gel derived TiO2 only anatase phase was identified, while in commercial TiO2 anatase and rutile phases co-exist. Titania support effect on Au activity for the oxidation of CO has been observed. The light-off during the reaction on Au/TiO2initiates at 50°C, whereas for commercial impregnated TiO2 catalyst the light-off initiates at 200°C.
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