Ternary alloys of platinum group metals attract a growing interest due to their unique catalytic properties. The present research is aimed to synthesize a series of Rh-Pd-Pt alloys with varied ratios of metals using a single-source precursor approach. Rhodium and palladium are partly miscible metals, while each of these metals is unlimitedly miscible with platinum. Thermolysis of complex salts used as a precursor results in the formation of metastable systems. The 3D nanostructure alloys are being formed after the complete decomposition of the single-source precursor. High-resolution transmission electron microscopic studies have shown that the nanoalloys are composed of interconnected polycrystalline ligaments with a mean diameter of 50 nm. The single-phase composition is confirmed by an X-ray diffraction analysis. The ratio of metals plays an important role in determining the catalytic activity of alumina-supported alloys and their thermal stability. According to UV-vis spectroscopy data, the higher palladium portion corresponds to worse dispersion of initially prepared, fresh catalysts. Treatment of the catalysts under prompt thermal aging conditions (up to 800 °C) causes redispersion of palladium-rich alloyed nanoparticles, thus leading to improved catalytic activity and thermal stability.

中文翻译：

---

三元Rh-Pd-Pt合金对CO氧化过程的吸引力

铂族金属的三元合金由于其独特的催化性能而引起了越来越多的兴趣。本研究旨在使用单源前驱体方法合成一系列具有不同金属比例的Rh-Pd-Pt合金。铑和钯是部分可混溶的金属，而每种金属都可与铂无限混溶。用作前体的复合盐的热解导致形成亚稳体系。3D纳米结构合金是在单源前体完全分解后形成的。高分辨率透射电子显微镜研究表明，纳米合金由平均直径为50 nm的互连多晶韧带组成。单相组成通过X射线衍射分析确认。金属的比例在确定氧化铝负载合金的催化活性及其热稳定性方面起着重要作用。根据UV-可见光谱数据，较高的钯部分对应于最初制备的新鲜催化剂的较差的分散。在迅速的热老化条件下（高达800°C）处理催化剂会导致富钯合金纳米颗粒的重新分散，从而提高了催化活性和热稳定性。