Visualizing catalyst heterogeneity by a  multifrequential oscillating reaction.

ABSTRACT: It is well documented that different surface structures of catalytically active metals may exhibit different catalytic properties. This is typically examined by comparing the catalytic activities and/or selectivities of various well-defined smooth and stepped/kinked single crystal surfaces. Here we report the direct observation of the heterogeneity of active polycrystalline surfaces under reaction conditions, which is manifested by multifrequential oscillations during hydrogen oxidation over rhodium, imaged in situ by photoemission electron microscopy. Each specific surface structure, i.e. the crystallographically different µm-sized domains of rhodium, exhibits an individual spiral pattern and oscillation frequency, despite the global diffusional coupling of the surface reaction. This reac

SUBMITTER: Suchorski Y 

PROVIDER: S-EPMC5807506 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature