The intermetallic compound (IC) formation between Pd and Ce via reductive metal-support interaction (RMSI) has been studied using two different Pd/CeO₂ materials: A thin film of Pd particles embedded in fluorite-type CeO₂, grown on vacuum-cleaved NaCl(001) facets and CeO₂ powder impregnated with small Pd particles. The reduction of CeO₂ and formation of different Pd-Ce intermetallic compounds has been monitored by diffraction in an electron microscope and synchrotron-based in situ X-ray diffraction, and is complemented by density functional theoretical calculations (DFT) of the formation enthalpies to judge the relative stabilities of the formed intermetallic compounds. On both studied materials, the formation of similar ICs, namely CePd₃ and CePd₅, has been observed for the first time at temperatures of 1100 K following RMSI and, thus, indicates that any catalytic pre-treatment in hydrogen, provided the reduction temperature is high enough, must also be considered for the Pd-CeO₂ system. The studies are complemented by a brief review of the Pd-Ce phase diagram to discuss the potential pathways of Pd-Ce intermetallic compound formation.

使用两种不同的Pd / CeO ₂材料研究了Pd和Ce之间通过还原性金属-载体相互作用（RMSI ）形成的金属间化合物（IC）：嵌入萤石型CeO _2中的Pd颗粒薄膜，在真空下生长。裂解NaCl（001）晶面和浸有小Pd颗粒的CeO ₂粉末。通过电子显微镜中的衍射和基于同步加速器的原位监测了CeO ₂的还原和不同Pd-Ce金属间化合物的形成X射线衍射，并由形成焓的密度泛函理论计算（DFT）进行补充，以判断所形成的金属间化合物的相对稳定性。在两种研究的材料上，RMSI之后在1100 K的温度下首次观察到相似的IC，即CePd ₃和CePd ₅的形成，因此表明在还原温度下，在氢气中进行的任何催化预处理足够高，对于Pd-CeO ₂系统也必须考虑。通过简要回顾Pd-Ce相图以讨论Pd-Ce金属间化合物形成的潜在途径，可以补充这些研究。