By carefully mixing Pd metal nanoparticles with CeO 2 polycrystalline powder under dry conditions, an unpredicted arrangement of the Pd‐O‐Ce interface is obtained in which an amorphous shell containing palladium species dissolved in ceria is covering a core of CeO 2 particles. The robust contact that is generated at the nanoscale, along with mechanical forces generated during mixing, promotes the redox exchange between Pd and CeO 2 and creates highly reactive and stable sites constituted by PdO x embedded into CeO 2 surface layers. This specific arrangement outperforms conventional Pd/CeO 2 reference catalysts in methane oxidation by lowering light‐off temperature by more than 50°C and boosting the reaction rate. The origin of the outstanding activity is traced to the structural properties of the interface, modified at the nanoscale by mechanochemical interaction.
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Danielis et al. (2018) studied this question.
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