负载型纳米Pd-M(Ag,Cu)催化剂的制备与催化性能

Preparation and Catalytic Property of Loaded Pd-M(Ag,Cu) Catalysts

以自制的聚N,N-二乙基丙烯酰胺接枝聚丙烯腈/聚苯乙烯(PDEAm-g-PAN/PSt)微球作为载体,采用原位还原方法,将与酰胺基团配位的金属离子还原成纳米金属颗粒,制得负载型纳米Pd-M(Ag,Cu)催化剂。采用扫描电子显微镜(SEM)对聚合物微球进行表征,采用透射电子显微镜(TEM)、X射线衍射(XRD)、能谱分析(EDS)和热重分析(TGA)对负载型催化剂进行表征,结果表明:该聚合物微球表面呈现规整的花状形态,Pd-M颗粒均匀分散于PDEAm-g-PAN/PSt微球表面,其粒径约为10nm。将制备的Pd-M(Ag,Cu)催化剂应用于1-辛烯的催化加氢反应,并与商业化催化剂Pd/C相比,催化1-辛烯加氢的效率为Pd-Cu>Pd-Ag>Pd/C。

Pd-M（Ag,Cu） bimetallic catalysts can be easily prepared via in situ reduction of the corre- sponding Pd2＋ , Ag＋ and Cu2＋ that the coordination interaction took place between the metal ions and amide of poly（N, N-diethylacrylamide） （PDEAm） using as-prepared PDEAm grafted poly （aeryloni- trile/styrene） （PDEAm-g-PAN/PSt） microspheres as carrier. The ultrafine dispersed Pd-M （Ag,Cu） bimetallic nanoparticles were loaded on the surfaces of the PDEAm-g-PAN/PSt microspheres. The Pd-M bimetallic catalysts were characterized by transmission electron microscopy （TEM）, X-ray dif- fraction （XRD）, energy dispersive X-ray spectrum （EDS） and thermo-gravimetric analysis （TGA）. The results show that PDEAm-g-PAN/PSt microspheres have obvious flower-shape morphology,and Pd-M（Ag,Cu） nanoparticles are formed on the surface of polymer microspheres with the average par- ticle size in about 10nm,and the catalytic efficiency of the Pd-M （Ag,Cu） is evaluated in hydrogena- tion reactions of 1-octylene. The catalytic efficiency of Pd-M bimetallic catalysts is higher than that of Pd/C, and the efficiency order is Pd-Cu〉Pd-Ag〉Pd/C.