Coexisting multi-states in catalytic hydrogen oxidation on rhodium

Winkler, P. (author): Technische Universität Wien,Vienna University of Technology

Zeininger, Johannes (author): Technische Universität Wien,Vienna University of Technology

Raab, M. (author): Technische Universität Wien,Vienna University of Technology

Suchorski, Y. (author): Technische Universität Wien,Vienna University of Technology

Steiger-Thirsfeld, A. (author): Technische Universität Wien,Vienna University of Technology

Stoger-Pollach, M. (author): Technische Universität Wien,Vienna University of Technology

Grönbeck, Henrik, 1966 (author): Chalmers tekniska högskola,Chalmers University of Technology

Rupprechter, G. (author): Technische Universität Wien,Vienna University of Technology

(creator_code:org_t)

2021-11-11
2021
English.
In: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723 .- 2041-1723. ; 12:1

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Abstract Subject headings

Catalytic hydrogen oxidation on a polycrystalline rhodium foil used as a surface structure library is studied by scanning photoelectron microscopy (SPEM) in the 10−6 mbar pressure range, yielding spatially resolved X-ray photoemission spectroscopy (XPS) measurements. Here we report an observation of a previously unknown coexistence of four different states on adjacent differently oriented domains of the same Rh sample at the exactly same conditions. A catalytically active steady state, a catalytically inactive steady state and multifrequential oscillating states are simultaneously observed. Our results thus demonstrate the general possibility of multi-states in a catalytic reaction. This highly unusual behaviour is explained on the basis of peculiarities of the formation and depletion of subsurface oxygen on differently structured Rh surfaces. The experimental findings are supported by mean-field micro-kinetic modelling. The present observations raise the interdisciplinary question of how self-organising dynamic processes in a heterogeneous system are influenced by the permeability of the borders confining the adjacent regions.

By the author/editor: Winkler, P.; Zeininger, Johan ...; Raab, M.; Suchorski, Y.; Steiger-Thirsfel ...; Stoger-Pollach, ...; show more...; Amati, M.; Gregoratti, L.; Grönbeck, Henrik ...; Rupprechter, G.; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Inorganic Chemis ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Physical Chemist ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

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