碳烟氧化催化剂La(Nd)PbK的催化活性及抗硫性能  

Catalytic Activity and Sulfur-resistant Performance of Soot Oxidation Catalysts La(Nd)PbK

作　　者：姜斌[1] 张凤丽[1] 张永恒[1] 

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042

出　　处：《青岛科技大学学报（自然科学版）》2009年第5期399-404,411,共7页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：山东省中青年科学家奖励基金资助项目(2006BS08023)

摘　　要：采用涂抹法制备负载在α-Al2O3陶瓷基片上的碳烟氧化催化剂,用程序升温反应装置(TPR)研究了不同组分催化剂的催化活性,并考察其吸水性和抗硫性能。结果表明:当n(Pb)∶n(K)=1∶2时催化剂起燃温度仅为308℃,最高的峰值氧化温度405℃,在448℃左右,催化剂作用下,碳烟完全氧化。当n(Nd)∶n(Pb)∶n(K)=1∶1∶10和n(La)∶n(Pb)∶n(K)=1∶1∶10时催化剂的起燃温度分别为308℃和313℃;峰值氧化温度分别在403℃和410℃。催化剂经硫化后,n(Nd)∶n(Pb)∶n(K)=2∶1∶10和n(La)∶n(Pb)∶n(K)=1∶1∶2时催化剂的起燃温度分别为352℃和357℃。表明稀土金属La、Nd的加入提高了催化剂的催化活性、吸水性及抗硫中毒性。The soot oxidation catalysts supported on Al2O3 ceramic substrate were prepared.by using the dip-coating method. The catalytic activity of the catalysts as well as the water absorbability and sulfur-resistant property were investigated. It was found that when the molar ratio of Pb ： K = 1 ： 2, the Pb/K catalyst behaved an ignition temperature of 308 ℃ and the highest oxidation rate occurred at a temperature of 405 ℃ and the soot was completely oxidized before 448 ℃. At the Nd（La） ： Pb ： K molar ratio of 1 ： 1 ： 10,the ignition temperatures and peak temperatures were 308 ℃ and 403 ℃ for the Nd/Pb/K,and 313 ℃ and 410 ℃ for the La/Pb/K. Apter sulfuration,the ignition temperature was 352 ℃ when the Nd ： Pb ： K molar ratio was 2 ： 1 ： 10, and 357 ℃ when the La ： Pb ： K molar ration was 1 ： 1 ： 2. The experimental results showed that the catalytic activity water-absorbing property and sulfur-resistant property were improved with addition of La and Nd elements.

关 键 词：碳烟 起燃温度 催化活性 抗硫性 

分 类 号：TQ426.7[化学工程]