Ce掺杂对La1-xCexCoO3催化剂的结构和催化氧化性能的影响  

Effect of Ce Doping on the Structure and Catalytic Activity of La_(1-x)Ce_xCoO_3 Catalysts

作　　者：BULGANG 梁淑惠[1] 滕飞[1] 姚文清[1] 朱永法[1] 

机构地区：[1]清华大学化学系,北京100084

出　　处：《物理化学学报》2008年第2期205-210,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20433010,20571047)

摘　　要：采用非晶态配合物的方法合成了La1-xCexCoO3(x=0、0.05、0.1、0.2、0.3)催化剂,并采用X射线衍射(XRD)、透射电镜(TEM)和比表面测定仪(BET)等手段对催化剂的微观结构进行了研究.揭示了Ce掺杂对催化剂的钙钛矿结构,CO催化氧化以及催化氧化发光性能的影响规律.结果表明,在Ce4+掺杂部分取代La3+后,催化剂形成了镧不足的La1-xCeyф x-yCoO3(ф是A位离子空位)钙钛矿相以及CeO2和Co3O4物相.与LaCoO3催化剂相比,x=0.1催化剂的CO催化氧化活性最高(T100%=290℃).La1-xCexCoO3催化剂对CO催化氧化发光的响应与其催化活性密切相关.La1-xCexCoO3 （x=0, 0.05, 0.1, 0.2, 0.3） catalysts were synthesized by amorphous heteronuclear complexing method. The catalysts were characterized by XRD, TEM, and N2 adsorption isotherms. The cataluminescence （CTL） response to CO and the activities in the oxidation of CO over the catalysts were investigated. Results showed that La1-xCeyФx-yCoO3 perovskite with lanthanum deficiency, CeO2 and CO3O4 phases were formed after La^3＋ was substituted with Ce^4＋ in the catalyst. Compared with LaCoO3 catalyst, the catalyst with x=0.1 showed the highest activity for CO oxidation （T100%=290 ℃）. The CTL result is well consistent with the order of CO catalytic activity over La1-xCexCoO3 catalysts.

关 键 词：非晶态配合物 钙钛矿型催化剂 铈掺杂 催化发光 催化氧化 CO 

分 类 号：O643.36[理学—物理化学]