Cover Picture: Operando Spectroscopy Unveils the Catalytic Role of Different Palladium Oxidation States in CO Oxidation on Pd/CeO2 Catalysts (Angew. Chem. Int. Ed. 23/2022)

Operando spectroscopy captures the dynamic behavior of ceria-supported Pd single atoms, clusters, and nanoparticles during CO oxidation. In their Research Article (e202200434), Emiel J. M. Hensen et al. elucidate the catalytic role of different Pd species using a combination of in situ spectroscopy with transient and steady-state kinetic analysis. Highly dispersed Pd–oxo species and interfacial Pd sites catalyze low-temperature CO oxidation, while metallic Pd contributes to the activity at elevated temperature.