【摘要】 用原位光沉积法制得 Au/TiO₂催化剂，以 CO 氧化为探针，通过 XRD、SEM、TEM、XPS、TPD、in situ EPR 和 in situ DRIFTS 测试对材料的结构和性能进行表征 . 结果表明：Au 纳米粒子的粒径分布在 3.5 nm 左右，TiO₂表面的缺陷态会向 Au 粒子转移电子，使其表面电子密度增加，有利于 CO 和 O₂的吸附；CO 与 TiO₂晶格氧作用后产生氧空位，促进 O₂在氧空位的吸附与活化，并再生补充晶格氧；Au/TiO₂样品在 CO 氧化中展现出超高的活性，且在Au的LSPR效应作用下具有明显的光促作用.更多还原

【Abstract】 The Au/TiO₂ catalyst was prepared by the mild in situ photo-deposition method and follow by heat treatment.The CO oxidation was used as a probe.The structure and properties of the materials were characterized by XRD,SEM,TEM,XPS,TPD,in situ EPR and in situ DRIFTS.The results showed that the Au/TiO₂ sample owned the sizes about 3.5 nm of Au nanoparticles （Au NPs）,and TiO₂ could transfer electrons to Au NPs caused the increase in surface electron density of Au NPs,resulting in the enhanced adsorption of CO and O₂ at Au sites.This adsorbed CO could interact with the lattice O of TiO₂ to form CO₂ accompanied by oxygen vacancy,while O₂ could be adsorbed at the oxygen vacancy to form the lattice O of TiO₂ again.The Au/TiO₂ samples exhibited ultra-high activity in CO oxidation,and had obvious photo-promoting effect under the LSPR effect of Au.更多还原