The shape impact of nanostructured ceria on the dispersion of Pd species was investigated by analyzing the atomic configuration and the bonding environment of Pd species over spherical and cubic ceria particles, using STEM and XPS. Amorphous Pd particles of about 2.0 nm, with a substantial amount of tiny Pd species, dispersed on spherical ceria, primarily due to the enriched surface oxygen vacancies that bonded the Pd species tightly. While faceted Pd particles of about 2.9 nm located on cubic ceria with distinct interfaces where Pd atoms embedded into the ceria lattice. The crystalline Pd particles on ceria cubes were highly active and stable for methane combustion that occurred on the metal surface via a facile PdO/Pd redox cycle; while the amorphous Pd particles on spherical ceria particles were featured by a significantly higher activity and stability towards CO oxidation, where the Pd-ceria interface served as the active sites.

通过使用 STEM 和 XPS 分析球形和立方氧化铈颗粒上 Pd 物质的原子构型和键合环境，研究了纳米结构氧化铈对 Pd 物质分散的形状影响。约 2.0 nm 的无定形 Pd 颗粒，带有大量微小 Pd 物质，分散在球形氧化铈上，主要是由于富集的表面氧空位与 Pd 物质紧密结合。而约 2.9 nm 的刻面 Pd 颗粒位于立方氧化铈上，具有不同的界面，其中 Pd 原子嵌入到氧化铈晶格中。氧化铈立方体上的结晶 Pd 颗粒对于通过简单的 PdO/Pd 氧化还原循环在金属表面发生的甲烷燃烧具有高活性和稳定性；