Ce_(0.5-x)Zr_(0.5-x)Ba_(2x)O_2负载TiO_2光催化降解气相苯  

Gas-Phase Photocatalytic Oxidation of Benzene over TiO_2 Supported on Ce_(0.5-x)Zr_(0.5-x)Ba_(2x)O_2

作　　者：皮展[1] 蔡黎[1] 钟俊波[1] 龚茂初[1] 陈耀强[1] 

机构地区：[1]四川大学催化材料研究所,四川成都610064

出　　处：《催化学报》2008年第5期453-457,共5页

基　　金：国家自然科学基金(20773090)

摘　　要：在密闭不锈钢反应器内研究了Ce0.5-xZr0.5-xBa2xO2负载锐钛型TiO2光催化降解气相苯的性能.确定了该系列光催化剂的最佳Ba含量,并应用X射线衍射、紫外-可见漫反射光谱以及X射线光电子能谱对催化剂进行了表征.结果表明,TiO2在载体表面均匀分散.在210～400 nm范围内,TiO2/Ce0.5-xZr0.5-xBa2xO2比TiO2吸收更多的紫外光.TiO2/Ce0.5-xZr0.5-x-Ba2xO2包含Ti和O两种元素,TiO2/Ce0.5-xZr0.5-xBa2xO2的Ti 2p结合能向低能端偏移.Ce0.5-xZr0.5-xBa2xO2表面负载TiO2能有效提高催化剂的光催化活性.Ce0.5-xZr0.5-xBa2xO2的作用是转移电子和使催化剂在紫外区的吸收增强.Photooxidation of gaseous benzene was investigated using anatase TiOa as the catalyst in a closed steel reactor, The photocatalytic activity can be greatly improved by supporting TiOa on Ce0.5-xZr0.5-xBa2xO2. The optimal Ba content in the photocatalyst was investigated, The prepared photocatalysts were characterized by X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy, The results revealed that the deposited titania is well dispersed as in the Ce0.5-xZr0.5-xBa2xO2 matrix. TiO2/Ce0.5-xZr0.5-xBa2xO2 absorbs much more ultraviolet light in the range of 210-400 nm than TiO2, There are Ti and O elements on the surface of TiO2/Ce0.5-xZr0.5-xBa2xO2, and the binding energy of Ti 2p of TiO2/Ce0.5-xZr0.5-xBa2xO2 shifts to a lower value. Based upon the above observations, it is concluded that the role of Ce0.5-xZr0.5-xBa2xO2 is to transfer electrons and enhance the light absorption of the catalyst in the region of 210-400 nm.

关 键 词：二氧化钛 光催化氧化 苯 铈-锆固溶体 挥发性有机化合物 

分 类 号：O643.3[理学—物理化学]