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Title of article :
Supported gold catalysts in SBA-15 modified with TiO2 for oxidation of carbon monoxide Original Research Article
Author/Authors :
C.L. Peza-Ledesma، نويسنده , , L. Escamilla-Perea، نويسنده , , R. Nava، نويسنده , , B. Pawelec، نويسنده , , J.L.G. Fierro، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
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Abstract :
This contribution describes the effect of SBA-15 support modification with variable quantity of TiO2 (0, 10, 20, 40 and 60 wt%) on the catalytic response of supported gold catalysts in CO oxidation. All gold catalysts were prepared by the deposition–precipitation method. These catalysts were characterized by chemical analysis (ICP), N2 adsorption–desorption isotherms, X-ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy (UV–vis DRS), high resolution transmission electronic microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). Catalytic activity was found to increase with the TiO2 loading even though this increase was not lineal: the highest catalytic activity was observed for the catalyst loaded with 10 wt% TiO2. This behavior is explained in terms of the quantity of Au+ species present on the surface of gold particles. In addition, an Au/TiO2 reference sample was prepared and tested in CO oxidation reaction. This Au/TiO2 catalyst exhibited the highest activity due to the higher gold dispersion achieved on the TiO2 substrate. The importance of both Au+ and Au0 species present on the catalysts surface on the performance in the target reaction is discussed.
Keywords :
CO oxidation , Titania , SBA-15 , Gold nanoparticles
Journal title :
Applied Catalysis A:General
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