中文摘要：

采用沉积沉淀法制备了CO低温氧化Au／α-Fe2O3催化剂，利用X射线衍射（XRD）、X射线光电子能谱（XPS）、BET比表面测定、程序升温还原（H2-TPR）等表征技术，对比了制备过程pH值的微小变化、焙烧及光线照射对催化剂结构及催化性能的影响，探明了Au／α-Fe2O3催化剂的活性物种。结果表明，110℃处理的Au／α-Fe2O3催化剂表面同时存在Au^3＋、Au^0以及过渡态Au^δ＋（0〈δ〈1），它们对CO氧化的活性顺序为Au^3＋〉Au^δ＋〉Au^0；pH值为8条件下制备的催化剂Au^3＋含量高、比表面积大，催化性能最好：高温焙烧使氧化态金还原的同时也使载体比表面积严重缩小，催化活性显著下降：紫外线照射可以引起Au^3＋的逐渐还原以及Au^0颗粒的生长，其催化失活作用弱于高温焙烧。

英文摘要：

Au/α-Fe2O3 catalysts for CO oxidation were prepared by chemical coprecipitation at different pH values, and the as-prepared samples were calcined or UV （2=254 nm） irradiated, respectively. The structure was characterized by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, N2 adsorption and desorption analysis （BET） and temperature programmed reduction （H2-TPR）, and the active Au species on the catalysts was investigated. The results show that Au^3＋, Au^δ＋ （0〈δ〈1） and Au^0 coexist on the surface of Au/α-Fe2O3 catalysts treated at 110 ℃, and their activity order is Au3＋〉 Aua＋〉 Au~. The sample prepared at pH=8 shows the best catalytic performance since it has more Au^3＋ species and high specific surface area. High temperature calcination can cause serious deactivation due to the reduction of Au^3＋ and Au^δ＋ species, together with the decrease of the specific surface area of α-Fe2O3. UV irradiation can also cause the reduction of oxidative Au species and the growth of Au particle.