La_(2-x)K_xCuO_4类钙钛矿复合氧化物对柴油车排放碳颗粒物催化燃烧性能的研究  

Catalytic Combustion of Diesel Soot over K_2NiF_4-type Oxides La_(2-x)K_xCuO_4

作　　者：朱玲[1] 王学中[2] 梁存珍[1] 

机构地区：[1]北京石油化工学院环境工程系,北京102617 [2]中国环境科学研究院,北京100012

出　　处：《中国稀土学报》2006年第5期528-533,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家重大基础研究项目(2004CB719500)资助

摘　　要：使用溶胶-凝胶法制备了纳米级不同K取代量的La2-xKxCuO4催化剂,通过H2-TPR,XRD,FT-IR和SEM等多种分析方法对催化剂进行了表征,利用程序升温氧化反应(TPO)就催化剂对碳颗粒物燃烧的催化活性进行了评价。结果表明:以K+部分取代La2CuO4中的La3+,La2-xKxCuO4催化剂对soot催化燃烧的活性明显提高,其中K+的取代量对La2CuO4的晶形和活性都产生不同的影响;当x=0.2时,La1.8K0.2CuO4催化剂上呈四方晶相,soot的起燃温度下降到320℃。The K2NiF4 type oxides, La2-x KxCuO4 complex oxides with nanometric size were prepared by sol-gel method. The characters of these samples were analyzed by H2-TPR, XRD, FT-IR and SEM. The catalytic activity for soot combustion was evaluated by temperature-programmed reaction （TPO） technique. The results demonstrate that the substitution of K^＋ for La^3＋ at A-site will increase the catalytic activities of La2-xKxCuO4 to soot combustion greatly, and the substitution quantity affects the structure and catalytic activity obviously. The Lals KO2 CuO4 complex oxides with tetrahedral structure has the best catalytic activity for soot removal reaction, the ignition temperature of soot combustion is decreased from 490 to 320℃.

关 键 词：类钙钛矿复合氧化物 柴油车排气碳颗粒物 催化燃烧 稀土 

分 类 号：O643.3[理学—物理化学]