【摘要】 采用程序升温还原（TPR）技术研究了热处理对负载于 Al₂O₃上的 Pd-Pt 双金属及其单金属催化剂的还原性能的影响。发现热处理温度和气氛的变化对 Pd/Al₂O₃和 Pt/Al₂O₃单金属催化剂以及 Pd-Pt/Al₂O₃双金属催化剂的 TPR 曲线有着明显的影响。Pd-Pt/Al₂O₃及其单金属催化剂的TPR 曲线亦有着明显的差异,其还原峰位发生明显的位移。讨论了负载于 Al₂O₃上的 Pd-Pt 双金属及其单金属催化剂在还原过程中金属与金属、金属与载体之间的相互作用以及热处理条件对其催化剂的还原性能的影响。更多还原

【Abstract】 The effect of thermal treatment on the reducibility of the Al₂O₃-supportedPd-Pt bimetallic and its mono-metal catalysts has been investigated with tem-perature-programmed reduction（TPR）technique.It is found that when these catalystsare treated at different temperatures,different TPR profiles are produced.Andthere is obvious difference between the TPR profiles of the Al₂O₃-supported Pd-Pt bimetallic and its mono-metal catalysts.Displacement in reduction peaks arealso observed.There is indication that interactions occur between Pd and Pt,Pdand Al₂O₃,and Pt and Al₂O₃ in the catalysts during reduction process.The resultsshowed that the reducibility of these catalysts is affected by variations in thethermal treatment conditions.更多还原