Investigation of Local Structure and Enhanced Thermal Stability of Ir-Doped PdRu Nanoparticles for Three-Way Catalytic Applications

The local structure and thermal stability of newly synthesized PdRuIr PdRu alloy nanoparticles (NPs) were studied using X-ray absorption fine spectroscopy (XAFS) compared with those Ru NPs. Pd K-edge XAFS reveals that a significant fraction segregates, forming metal NP clusters. In the NPs, small forms an Ir, whereas majority phase is Ru–Ir having novel face-centered cubic structure. Apart from distinct surroundings, analysis revealed presence anharmonic disorder in previously observed enhanced Ir doping was investigated temperature-dependent situ XAFS. abrupt change near-edge features at 673 K, which gradually suppressed for At this temperature, dynamical fluctuations more pronounced pure helping to convert surface-adsorbed O2 into volatile RuO4 phase, thereby leading earlier evaporation Ru. Dynamical fluctuation suppresses alloying elements or gets extended higher delay formation process enhancing NPs increasing order.