Low temperature CO oxidation over gold supported mesoporous Fe-TiO2

Abstract

A series of gold supported mesoporous Fe-TiO2 samples were prepared by the borohydrate reduction method. Fe-TiO2 (1.0, 3.0, 5.0. 7.0 wt%) was prepared by the incipient wetness impregnation method. These catalysts were characterized by TEM, XPS, UV-vis DRS, photoluminescent spectra (PL), TPR/TPD, BET surface area etc. A detail study has been carried out to know the effect of iron on the physico-chemical and catalytic property of gold-titania catalyst. Iron doping influences the surface and electronic properties of Au-TiO2. The activity of these catalysts for CO oxidation was evaluated. We observed higher catalytic activity of gold supported Fe-TiO2 catalysts compared to gold supported TiO2. We found that the catalyst with 5 wt% of Iron was the most active catalyst. The gold supported Fe-TiO2 catalyst does not lose its activity over several hours even at 500 C, in marked contrast to Au-TiO2. Iron doping enhances the catalytic activity of Au-TiO2 as well as stabilizes the catalyst at high temperature. (C) 2009 Elsevier B.V. All rights reserved.