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通过在多元金属体系中加入络合剂四氢呋喃(THF),改变其热力学参数进而改变其动力学还原速率,在低温下同时还原金属Pt和Ru,制备了高分散、高合金化的Pt-Ru固溶体并均匀担载在有序介孔碳CMK-3上,以形成二元复合金属催化剂.XRD图谱表明,f.c.c结构中Pt原子部分被h.c.p结构中Ru原子取代形成置换固溶体,且几乎没有未合金的Ru存在.TEM,XRD和N2吸附-脱附研究显示,Pt-Ru/CMK-3催化剂中Pt-Ru合金粒子的平均粒径为3.2nm,且具有良好的均一度.还研究了催化剂对甲醇的电催化氧化性能,并与E-TEK公司同类催化剂进行了对比.结果显示,Pt-Ru/CMK-3催化剂拥有较大的电化学活性面积,对甲醇的电催化氧化性能和抗CO中毒能力明显优于其他同类催化剂.
The highly dispersed and highly alloyed Pt-Ru solid solution was prepared by adding THF as the complexing agent, changing its thermodynamic parameters and then changing its kinetic reduction rate, and simultaneously reducing Pt and Ru at low temperature And uniformly supported on the ordered mesoporous carbon CMK-3 to form a binary composite metal catalyst XRD patterns show that the fcc structure of Pt atoms in the hcp structure is replaced by Ru atomic substitution solution, and almost no unalloyed Ru exist.The results of TEM, XRD and N2 adsorption-desorption showed that the Pt-Ru / CMK-3catalyst had an average particle size of 3.2nm and a good homogeneity.At the same time, The electrocatalytic oxidation performance of Pt-Ru / CMK-3 catalyst was compared with that of similar catalysts from E-TEK Corp. The results showed that the Pt-Ru / CMK-3 catalyst possessed a large electrochemically active area, Obviously superior to other similar catalysts.