Low temperature CO oxidation on Au/TiO2 sol-gel catalysts |
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| Authors: | M Morán-Pineda S Castillo and R Gómez |
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| Institution: | (1) IM-FQG Eje Central Lázaro Cárdenas 152, Instituto Mexicano del Petróleo, México D.F., 07730;(2) Dept. of Chem A.P. 55-534, Universidad Autónoma Metropolitana-I, México D.F., 09340 |
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| 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 Å 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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| Keywords: | Au/TiO2 sol-gel catalysts CO oxidation on Au/TiO2 catalysts gold particle size on Au/TiO2 |
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