氧化铈对Pd催化剂氧化活性和热稳定性的影响  

Effects of Cerium Oxide on the Oxidation Activity and Thermal Stability of Pd/Al_ 2O_3 Catalysts

作　　者：赫崇衡[1] 朱明[2] 金国林[2] 徐佩若[1] 汪仁[1] 

机构地区：[1]华东理工大学化工学院,上海200237 [2]上海石油化工研究院物化室

出　　处：《应用化学》2004年第2期154-158,共5页Chinese Journal of Applied Chemistry

基　　金：国家教委行动计划华东理工大学基金资助项目 (XD2 0A0 13 0 1)

摘　　要：用氧化铈对Pd/Al2 O3 进行了表面修饰 ,考察了氧化铈对钯催化剂氧化活性和热稳定性的影响。结果显示 ,氧化铈能促进单钯催化剂对模拟尾气中CO和C3 H6的氧化活性。由于氧化铈具有较强的贮 放氧能力 ,所以加宽了还原环境下 (λ>1 )氧化反应的操作窗口。此外 ,氧化铈的修饰可以提高Pd粒子在Al2 O3 表面的热稳定性 ,这可能是由于钯与氧化铈在高温下发生相互作用形成了更加稳定的Pdδ + 物种的缘故。The effects of cerium oxide on the catalytic activity and the thermal stability of Pd/Al 2O 3 were investigated. It was found that the cerium oxide improved the performance of Pd/Al 2O 3 catalysts in removal of CO and C 3H 6 from simulated exhaust gas. The cerium oxide could widen the operation-window of oxidation reaction under reduction conditions (λ>1) due to its high oxygen storage-release capacity. Moreover, a great advantage of cerium oxide as a promoter is that it stabilizes the dispersion of Pd particles on the surface of Al 2O 3 during the sintering process. It may be due to the interaction of Pd with cerium oxide to form a Pd δ+ species which are more stable than Pd 0 at high temperature.

关 键 词：钯催化剂 氧化铈 催化氧化 热稳定性 

分 类 号：O643[理学—物理化学]