In the past decade, the use of bimetallic nanoparticles (NPs) as catalytic systems has demonstrated to be an effective method to overcome the unfortunate shortage of expensive Pd-like metals. These NP systems exbibit excellent catalytic activities. In this paper, we present a method to immobilize PdRu and CuRu NPs in the mesopores of hierarchical porous SiO₂ using a supercritical CO₂ (scCO₂) solution, employing commonly available metal-organic complexes as feed materials. Scanning TEM coupled with electron dispersive X-ray spectroscopy (STEM-EDX) revealed the homogeneous distribution of the single metal components in the NPs. The resulting PdRu@SiO₂ and CuRu@SiO₂ systems exhibited higher activities for CO oxidation than those of monometallic Pd@SiO₂, Ru@SiO₂, and Rh@SiO₂. Our results show that coupling Ru with Pd or Cu in nanosized structures can afford excellent catalytic systems at a lower cost compared to that of their monometallic counterparts.

在过去的十年中，使用双金属纳米颗粒（NPs）作为催化系统已被证明是克服了昂贵的Pd类金属短缺的有效方法。这些NP系统具有出色的催化活性。在本文中，我们提出了一种使用超临界CO ₂（scCO ₂）溶液，以常用的金属有机配合物为原料，将PdRu和CuRu NPs固定在分级多孔SiO ₂的中孔中的方法。扫描TEM结合电子色散X射线光谱法（STEM-EDX）揭示了NP中单个金属成分的均匀分布。生成的PdRu @ SiO ₂和CuRu @ SiO ₂与单金属Pd @ SiO ₂，Ru @ SiO ₂和Rh @ SiO ₂相比，该体系具有更高的CO氧化活性。我们的结果表明，与单金属对应物相比，在纳米结构中将Ru与Pd或Cu偶联可以以较低的成本提供出色的催化体系。