Pattern Formation in Catalytic H₂ Oxidation on Rh: Zooming in by Correlative Microscopy.

ABSTRACT: Spatio-temporal nonuniformities in H₂ oxidation on individual Rh(h k l) domains of a polycrystalline Rh foil were studied in the 10^-6 mbar pressure range by photoemission electron microscopy (PEEM), X-ray photoemission electron microscopy (XPEEM), and low-energy electron microscopy (LEEM). The latter two were used for in situ correlative microscopy to zoom in with significantly higher lateral resolution, allowing detection of an unusual island-mediated oxygen front propagation during kinetic transitions. The origin of the island-mediated front propagation was rationalized by model calculations based on a hybrid approach of microkinetic modeling and Monte Carlo simulations.

SUBMITTER: Zeininger J 

PROVIDER: S-EPMC9552168 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature