Promoting Effects of Iron on CO Oxidation over Au/TiO₂ Supported Au Nanoparticles

Abstract

Fe-doped TiO₂ supported gold nanoparticles as high-performance CO oxidation catalysts were prepared. XRD data revealed that TiO₂ support was in an anatase phase. After calcination at 300 °C, the sample showed nanotube structure, and the size of gold nanoparticles was 3.1 nm. When calcined at 500 °C, most nanotubes broke, and gold nanoparticles grew up to 5.9 nm. XPS spectrum indicated the presence of Fe in the +3 oxidation state. Au/Fe-TiO₂(Au: 1.44%, Fe: 1.35%) calcined at 300 °C possessed the best catalytic activity, and it could completely convert CO at 25 °C. The temperature of 100% CO conversion(T _100%) of Fe-free catalyst was 40 °C. After the catalysts were stored at room temperature for 7 d, T _100% of Au/Fe-TiO₂ increased from 25 °C to 30 °C, while T _100% of Fe-free catalyst increased from 40 °C to 80 °C. The catalytic activity and storage stability of Au/TiO₂ could be improved by Fe-doping. The increase of specific surface area, generation of oxygen vacancies and new adsorption sites, depression of the growth of gold nanoparticles, and strong metal-support interaction were responsible for the promoting effect of iron on the catalytic performance of Au/TiO₂ for CO oxidation.

Keywords

Titanium dioxide / Nanotubes / Gold / Iron / Carbon monoxide

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