负载型Pt@Pd纳米粒子的制备与催化性能研究  

Preparation of loaded Pt@Pd nanoparticles and catalytic property

作　　者：任申玥 熊万斌 丁玉强 倪忠斌 陈明清 

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214122

出　　处：《应用化工》2011年第1期19-22,共4页Applied Chemical Industry

基　　金：国家自然科学基金(20671043);江苏省高等学校优秀科技创新团队(2007-5)资助项目

摘　　要：用聚N-乙烯基乙酰胺接枝聚丙烯腈/聚苯乙烯（PNVA-g-PAN/PSt）聚合物微球为载体,H2PtCl6为金属源,无水乙醇为还原剂,将配位的Pt4＋离子原位还原成为Pt纳米粒子负载于PNVA-g-PAN/PSt微球表面,进而在Pt纳米粒子上将Pd2＋还原,制备了负载型Pt@Pd纳米粒子。用透射电子显微镜（TEM）对所制负载型Pt@Pd纳米粒子的形态与尺寸大小进行表征,结果显示,Pt@Pd纳米粒子均匀分布在聚合物微球表面;TEM和X-射线衍射结果显示,Pt@Pd纳米粒子的平均粒径随H2PtCl6与PdCl2比例的增加出现先增大后减小的变化趋势,粒径在9~22.2 nm之间;对肉桂酸产率的测定结果显示,该负载型Pt@Pd纳米粒子对碘代苯与丙烯酸交叉偶联反应有良好催化活性。Using self-made poly（N-vinylacetamide）（PNVA） grafted polyacrylonitrile/polystyrene（PNVA-g-PAN/PSt） microspheres as matrix,H2PtCl6 as the metal source,ethanol as reducing agent,platinum nanoparticles were located onto surfaces of the PNVA-g-PAN/PSt microspheres by in-situ reduction method.Palladium ions were then reduced on the surfaces of platinum nanoparticles to form Pt@Pd nanoparticles.The shape and size of Pt@Pd nanoparticles were characterized by TEM.The results shows that reduced Pt@Pd nanoparticles were dispersed evenly on surfaces of the PNVA-g-PAN/PSt microspheres.The average size of the loaded Pt@Pd nanoparticles has a change that increases then decreases through increasing ratio of H2PtCl6 to PdCl2 based on the analysis of TEM and X-ray diffraction.It was found that the average size was about 9~22.2 nm.Furthermore,the catalytic activity of this loaded Pt@Pd nanoparticles for the cross-coupling reaction of iodobenzene with acrylic acid was good,which can be known from the yield measurement of cinnamic acid.

关 键 词：Pt@Pd纳米粒子 聚合物微球 原位还原 催化活性 

分 类 号：TB333[一般工业技术—材料科学与工程]