作　　者： ; ; ; ; ;

机构地区： 华东理工大学

出　　处： 《环境科学学报》 1994年第4期403-408,共6页

摘　　要： 应用脉冲－火焰反应装置、ＸＲＤ、ＴＰＲ和氢氧滴定技术来研究Ｐｄ－Ｃｕ－Ｍｎ－Ｃｅ－Ｏ三效催化剂的性能。实验结果表明，不同的制备Ｐｄ－Ｃｕ－Ｍｎ－Ｃｅ－Ｏ催化剂的方法，则催化活性各不相同。在分层制备的催化剂中，催化性能主要以外层组分性能为主；以混合浸渍法制备的样品中，ＣｕＭｎ＿２Ｏ＿４相消失，Ｃｕ－Ｍｎ－Ｃｅ－Ｏ表面氧环境发生变化；表面活性剂的添加改变了Ｐｄ的分布，使催化剂表面易于还原；这些改变均对催化剂的三效性能发生影响。催化剂表面的有效贮氧量与三效活性没有明显的关系。 The performances of Cu,Mn,Ce,Pd three-way catalysts are examinedby a pulse-flame-microreactor,XRD,TPR and hydrogen-oxygen titration. The results show that the activity of the catalysts which are prepared withdifferent methods differ from each other.Catalytic performance of thesamples prepared through layer by layer method is essentially the same asthat of the out-layer components.In the crystal phase CuMn_2O_4 disappearsand the surface oxygen environment changes.for the samples prepared with co-impregnating methods.Pd distribution is changed by the addition ofsurface active agents.So the surface of catalysts can be reduced easily. All the changes affect the performances of three- way catalysts. In addition,the efficient storage amount of surface oxygen is not obvi ously related tothe three-way activity.

关 键 词： 负载型催化剂 催化剂 三效催化剂 钯 铜 锰 铈

领　　域： [化学工程]