中文摘要：

采用溶胶-凝胶法制备了CeO2-TiO2载体,再用沉积沉淀法制备了Au/CeO2-TiO2催化剂.利用原位漫反射红外（FT-IR）,程序升温还原（TPR）、X射线衍射（XRD）、N2吸附-脱附方法考察了催化剂的结构和表面性能.结果表明,CeO2的存在有效抑制TiO2晶粒的长大,增加TiO2的比表面积和晶格应变,从而增强了Au和载体中TiO2的相互作用,使得催化剂表面的氧化能力显著增强.结合原位CO吸附的FT-IR结果表明,不同温度的还原预处理能有效改变催化剂表面氧物种的组成,并对不同氧物种在CO低温氧化过程中的作用进行了分析.

英文摘要：

CeO2-TiO2 was prepared by the sol-gel method, and Au was supported on CeO2-TiO2 by the deposition-precipitation （DP） method. The in-situ Fourier transform infrared spectroscopy （FT-IR）, temperature-programmed reduction （TPR）, X-ray diffraction （XRD） and N2 sorption were used to characterize the structure and the surface properties of catalyst. The results show that, the presence of CeO2 in TiO2 not only can increase its surface area and restrain the growth of TiO2 crystallites, but can also enhance the micro-strain of TiO2. Based on these effects, the interaction between gold crystallites and the TiO2 can be enhanced, resulting in a promotion of its oxidation capacity. The in-situ FT-IR spectra of CO adsorbed on the catalyst show that, the surface oxygen species of the catalyst can be changed by a reduction of surface at different temperatures, on which the function of various oxygen species for the CO oxidation was discussed.