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通过简单的浸渍-还原并随后在酸性溶液中处理制备了Pt-Cu双金属催化剂.利用电感耦合等离子体发射光谱、X射线衍射和X射线光电子能谱对不同处理条件下的Pt-Cu纳米粒子的结构和组成进行了表征.研究发现,Pt-Cu催化剂在高温H2中还原形成了PtCu3合金结构,酸洗处理后形成了包含Pt-骨架(Pt-skeleton)的表面结构和PtCu3合金核的纳米粒子.而Pt-骨架结构又可通过在H2中退火转变为规整的Pt-表层(Pt-skin)结构.Pt-表层表面修饰Fe氧化物后在CO选择氧化反应中表现出较好的催化性能.通过此方法制备的三金属Pt-Cu-Fe催化剂可达到与Pt-Fe相近的高活性,并且催化剂中Pt的用量大大降低.
The Pt-Cu bimetallic catalysts were prepared by simple impregnation-reduction and subsequent treatment in acid solution.Using inductively coupled plasma-atomic emission spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy, Pt-Cu nanoparticles under different treatment conditions The structure and composition of the Pt-Cu catalyst were characterized by means of X-ray diffraction (XRD), X-ray diffraction (XRD), XRD, SEM and XRD.The results showed that Pt-Cu catalyst was reduced to form PtCu3 alloy in high temperature H2. While the Pt-framework structure can be transformed into a regular Pt-skin structure by annealing in H2.The modified Pt oxide on Pt-surface layer shows better catalytic performance in CO selective oxidation reaction The three-metal Pt-Cu-Fe catalyst prepared by this method can achieve high activity similar to that of Pt-Fe, and the amount of Pt in the catalyst is greatly reduced.