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《Chinese Journal of Catalysis》 2006-12
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Preparation and Characterization of Nano-Structured Au/TiO_2 Catalyst with High Thermal Stability

L Qian, MENG Ming*, ZHA Yuqing(Department of Catalysis Science and Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China)  
Mesoporous TiO_2 was synthesized using triblock copolymer EO_ 20 PO_ 70 EO_ 20 (P123) as the organic template, and the Au/TiO_2 catalyst was prepared by the deposition-precipitation method. For comparison, industrial TiO_2 and a TiO_2 sample synthesized by the sol-gel method were also used as supports to prepare the Au/TiO_2 catalysts. N_2 adsorption-desorption, X-ray diffraction, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy were employed to characterize the structure and the morphology of the catalysts. The results show that the TiO_2 support synthesized using P123 as the organic template possesses uniform mesoporous structure with a narrow pore size distribution centered at ~6.1 nm. After supporting Au, the mesoporous structure of TiO_2 is well maintained only with the pore size decreasing to ~5.4 nm. The gold in the mesoporous TiO_2-supported catalyst calcined at 400 ℃ exists as Au0. The dispersion and the crystal size of Au on the three kinds of TiO_2 show much difference. On the TiO_2 prepared using P123, the crystal size of Au is 1-5 nm after calcination at 400 ℃, while on the other two supports, the Au crystal size reaches ~10 nm. In the ambient CO oxidation reaction, the former Au/TiO_2 catalyst exhibits very high activity and thermal stability even after calcination at 420 ℃, and the CO conversion over this catalyst is more than 90%. The other two Au catalysts supported on the industrial TiO_2 and the TiO_2 synthesized by the sol-gel method are almost completely deactivated after calcination at 320 and 370 ℃, respectively.
【Fund】: 教育部高等学校博士学科点专项科研基金(20040056028);; 天津市自然科学基金(05YFJMJC09700)资助项目.
【CateGory Index】: O643.36
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