摘要
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 nano-tube 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（T100%） of Fe-free catalyst was 40℃. After the catalysts were stored at room temperature for 7 d, T100% of Au/Fe-TiO2 increased from 25℃ to 30℃, while T100% 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 nanopartieles, and strong metal-support interaction were responsible for the pro-moting effect of iron on the catalytic performance of Au/TiO2 for CO oxidation.
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 nano-tube 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（T100%） of Fe-free catalyst was 40℃. After the catalysts were stored at room temperature for 7 d, T100% of Au/Fe-TiO2 increased from 25℃ to 30℃, while T100% 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 nanopartieles, and strong metal-support interaction were responsible for the pro-moting effect of iron on the catalytic performance of Au/TiO2 for CO oxidation.
基金
Supported by the National Natural Science Foundation of China（Nos.21271110, 21373120, 21301098）, the Applied Basic Research Programs of Science and Technology Commission Foundation of Tianjin, China（Nos.12JCYBJC13100, 13JCQNJC02000） and the Project of Innovation Team of the Ministry of Education of China（No.IRT 13022）.
