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

doi:10.1007/s40242-018-8141-y

Abstract

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℃, the sample showed nanotube structure, and the size of gold nanoparticles was 3.1 nm. When calcined at 500℃, 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℃ possessed the best catalytic activity, and it could completely convert CO at 25℃. The temperature of 100% CO conversion(T_100%) of Fe-free catalyst was 40℃. After the catalysts were stored at room temperature for 7 d, T_100% of Au/Fe-TiO₂ increased from 25℃ to 30℃, while T_100% of Fe-free catalyst increased from 40℃ to 80℃. 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.

Key words: Titanium dioxide, Nanotube, Gold, Iron, Carbon monoxide

ZHONG Siyuan, HAN Qiuwan, ZHU Baolin, HUANG Weiping and ZHANG Shoumin. Promoting Effects of Iron on CO Oxidation over Au/TiO₂ Supported Au Nanoparticles[J]. Chemical Research in Chinese Universities, 2018, 34(6): 965-970.

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

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