以TiO_2多孔微球为载体的CuO/TiO_2催化剂的制备、表征及CO氧化催化性能  

Preparation,Characterization and CO Oxidation Catalytic Properties of CuO/TiO_2 Catalysts Supported on Porous Microspheres Composed of TiO_2 Nanocrystals

作　　者：郭先芝[1] 黄静[1] 王彦美[1] 王淑荣[1] 张保龙[1] 吴世华[1] 

机构地区：[1]南开大学化学系,天津300071

出　　处：《高等学校化学学报》2008年第6期1220-1223,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20771061)资助

摘　　要：利用高分子反相悬浮聚合技术结合溶胶-凝胶法制备了纳米TiO2晶粒组成的多孔微球.以TiO2多孔微球为载体,利用浸渍法制备了CuO/TiO2催化剂,用示差扫描量热法、热重分析、X射线衍射和X射线光电子能谱(XPS)对TiO2多孔微球和催化剂进行了表征,并对其进行了CO催化氧化性能的评价.结果表明,于500℃焙烧的TiO2多孔微球基本为锐钛矿型结构,其粒径为19.5nm.XPS结果表明,催化剂中载体和活性组分存在相互作用,Cu除了以Cu2+的形式存在外,还以部分Cu+和Cu0的形式存在.CO催化氧化研究结果表明,催化剂的催化活性与浸渍液的浓度和催化剂的焙烧温度有关.用0.5mol/LCu(NO3)2·3H2O溶液浸渍得到的催化剂和于200℃焙烧得到的催化剂具有较好的催化活性.The porous TiO2 microspheres were prepared by the reversed-phase suspension polymerization and sol-gel method. The CuO/TiO2 catalysts with porous microspheres composed of TiO2 nanocrystals as the support were prepared by impregnation method. The properties of the porous TiO2 microspheres and CuO/TiO2 catalysts were studied by TG-DTA, X-ray diffraction, XPS and ICP. The catalytic properties of the catalysts for CO oxidation were studied via a microreactor-GC system. The results show that the porous microspheres were mainly composed of anatase TiO2 nanocrystals with a size of 19. 5 nm. The XPS results indicate that there was interaction between the support and the active component, and Cu mainly existed as Cu^2＋ with some other form. The catalytic activity of the catalysts depends on the concentration of the impregnation solution and the calcination temperature of the CuO/TiO2 catalysts. The catalyst impregnated in 0. 5 mol/L Cu （NO3）2·3H2O had a better catalytic activity. The optimum calcination temperature of the CuO/TiO2 catalysts was 200℃.

关 键 词：二氧化钛 多孔微球 浸渍法 CO催化氧化 CuO/TiO2催化剂 

分 类 号：O641[理学—物理化学] TQ426.65[理学—化学]