中文摘要：

采用共沉淀法制备了Ce0.1＋xTi0.5-xAl0.2Y0.1La0.1O1.8（0≤x≤0.4）材料, 并对所制备的材料进行了X射线衍射（XRD）和X射线光电子能谱（XPS）的表征, 测定了材料的比表面积（BET法）和储氧量（OSC）, 同时采用氢气程序升温还原（H2-TPR）和氨气程序升温脱附（NH3-TPD）研究了材料的还原性能和表面酸性. 研究结果表明, Ce/Ti摩尔比大于1∶2的材料能形成立方萤石结构的固溶体, Ce/Ti摩尔比为1时, 材料表面Ce4＋/Ce3＋摩尔比达到最大; 随着Ce/Ti摩尔比的增大, 材料的储氧能力先增大后减小, 而TPR还原峰温则是先减小后增大, 当Ce/Ti摩尔比为1时, 材料的储氧量达到最大, 为660 μmol/g; 还原峰峰温最低, 为616 ℃. 以制备的材料为载体制备了一系列Pt/Ce0.1＋xTi0.5-xAl0.2Y0.1La0.1O1.8三效催化剂, 并对催化剂进行了活性评价. 活性测试结果表明, 以Ce/Ti比为1的载体材料制成的催化剂对C3H8, CO和NO的起燃温度分别为236, 147和228 ℃, 表现出了优异的温度特性.

英文摘要：

Ce0.1＋xTi0.5-xAl0.2Y0.1La0.1O1.8 （0≤x≤0.4） mixed oxides were prepared by co-precipitation method and characterized by means of X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, nitrogen adsorption（BET） , oxygen storage capacity（OSC） , H2-temperature programmed reduction（ H2-TPR） and NH3-temperature programmed desorption （NH3-TPD）. The results of XRD revealed that there was only one single cubic phase in Ce0.1＋xTi0.5-xAl0.2Y0.1La0.1O1.8 system when x value increased from 0. 2 to 0. 4. The results of XPS showed that the ratio of superficial Ce^4＋/Ce^3＋ is maximal when x is 0. 2. With the increase of Ce/Ti ratio, OSC is increased to a maximum value, and then gradually decreased. When x value is 0. 2, the OSC reaches to 660 umol/g, and the reduction temperature of Ce^4＋ is the lowest according to the H2-TPR test （616℃ ）. In this paper, a series of Pt/Ce0.1＋xTi0.5-xAl0.2Y0.1La0.1O1.8 three-way catalysts were prepared and the catalytic activities of catalysts were investigated. The results revealed that Pt/Ce0.3 Ti0.3Al0.2Y0.1La0.1O1.8 exhibits excellent low-temperature catalytic activity. The light-off temperature of C3 H8, CO and NO over Pt/ Pt/Ce0.3 Ti0.3Al0.2Y0.1La0.1O1.8 is 236, 147 and 228℃, respectively.