The interplay between bulk oxygen diffusion and surface reactions in reducible metal oxides is key in heterogeneous catalysts, yet direct measurements of their coupling through transient kinetics and in situ spectroscopies have been lacking. Here, the authors uncover complex H₂-driven dynamics in ceria–zirconia using transient mass spectrometry along with in-situ Raman, near-ambient pressure X-ray photoelectron spectroscopy, machine learning potential-based molecular simulations, and multiscale kinetic modeling.
- Quentin Kim
- George Yan
- Dionisios G. Vlachos