氧化态、还原态多组元贵金属尾气净化催化剂催化性能的研究  

Study on Catalytic Activities of Oxidized or Reduced Polycomponenet Noble Metals Auto-catalysts

作　　者：旷成秀[1] 李凤仪[2] 

机构地区：[1]九江学院化学化工学院,江西九江332005 [2]南昌大学应用化学研究所,江西南昌330047

出　　处：《贵金属》2007年第1期32-36,共5页Precious Metals

基　　金：国家863计划资助项目(863-715-003-0130)

摘　　要：应用微反应装置研究了Pt-Pd/Al2O3和Pt-Rh-Pd/Al2O3催化剂的氧化态和还原态的催化活性,对催化剂进行了XRD、TPD、TPR表征,并对反应机制进行了探讨。结果表明,在氧化态和还原态Pt-Pd/Al2O3催化剂中,氧化态Pt-Pd/Al2O3催化剂的催化氧化性能优于还原态Pt-Pd/Al2O3催化剂,且具有相同的催化机制;在氧化态和还原态Pt-Rh-Pd/Al2O3催化剂中,氧化态Pt-Rh-Pd/Al2O3催化剂的催化氧化性能不如还原态Pt-Rh-Pd/Al2O3催化剂,主要是由不同的催化机制所引起的;氧与贵金属的结合不利于NO的还原。Catalytic activities of oxidized Pt-Pd/Al2O3 and reduced Pt-Pd/Al2O3 catalysts, oxidized Pt-Rh-Pd/Al2O3 and reduced Pt-Rh-Pd/Al2O3 catalysts were studied with flow-system micro reactor. All these catalysts were characterized by TPD, XRD and TPR and their catalytic mechanisms were discussed. The results showed that oxidation activity of oxidized Pt-Pd/Al2O3 catalyst is superior to that of reduced Pt-Pd/Al2O3 catalyst, and they have the same catalytic mechanism. The oxidation activity of oxidized Pt-Rh-Pd/Al2O3 catalyst is not as good as that of reduced Pt-Rh-Pd/Al2O3 catalyst, which is attributed to their different catalytic mechanisms. Noble metals combined with oxygen are harmful to the reduction activities.

关 键 词：金属材料 贵金属 氧化态和还原态 催化剂 

分 类 号：TQ426.96[化学工程]