Bimetallic carbon-supported PdBi catalysts were prepared by grafting. To do so a soluble complex of bismuth with exchangeable O-donor ligands was selected, and the carbon support was functionalized to increase the number of surface functions. The grafting procedure was carried out by contacting the various supports with solutions of Pd and/or Bi complexes, to allow ligand exchange reactions to take place between the complexes and the surface O-groups. The grafted fragments were then activated into carbon-supported nanoparticles, which were characterized to unravel the impact of grafting experimental variables on the physico-chemical characteristics of the materials obtained. The PdBi/C catalysts were finally tested in the archetypal glucose selective oxidation reaction, to assess the impact of those characteristics on the catalytic performance. It was found that simultaneous grafting gave larger nanoparticles than consecutive grafting, while higher number of stable surface functions allowed to obtain small and nicely distributed bimetallic nanoparticles. However, the surface functions were found to be deleterious for the catalytic activity, and the placement of the Bi promoter with respect to Pd active phase was identified as another key parameter for the activity, with grafting allowing to compare neatly samples where Bi is underneath, above or beside Pd.

通过接枝制备双金属碳载PdBi催化剂。为此，选择了具有可交换的O-供体配体的铋的可溶性配合物，并对碳载体进行了官能化处理以增加表面功能的数量。通过使各种载体与Pd和/或Bi络合物溶液接触来进行接枝过程，以使配体交换反应发生在络合物和表面O-基团之间。然后将接枝的片段活化为碳负载的纳米颗粒，其特征在于揭示接枝实验变量对所得材料的理化特性的影响。最后在原型葡萄糖选择性氧化反应中测试了PdBi / C催化剂，以评估这些特性对催化性能的影响。发现同时接枝比连续接枝产生更大的纳米颗粒，而更高数量的稳定表面功能允许获得小的且分布良好的双金属纳米颗粒。但是，发现表面功能对催化活性有害，并且Bi促进剂相对于Pd活性相的位置被确定为该活性的另一个关键参数，接枝可以比较干净地将Bi置于下面，在Pd上方或旁边。