Dynamics of ultrathin V-oxide layers on Rh(111) in catalytic oxidation of ammonia and CO

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Boehn, B. von; Preiss, A.; Imbihl, R.: Dynamics of ultrathin V-oxide layers on Rh(111) in catalytic oxidation of ammonia and CO. In: Physical chemistry chemical physics : PCCP 18 (2016), Nr. 29, S. 19713-19721. DOI: http://dx.doi.org/10.1039/C6CP03637F

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Abstract: 
Catalytic oxidation of ammonia and CO has been studied in the 10(-4) mbar range using a catalyst prepared by depositing ultra-thin vanadium oxide layers on Rh(111) (thetaV approximately 0.2 MLE). Using photoemission electron microscopy (PEEM) as a spatially resolving method, we observe that upon heating in an atmosphere of NH3 and O2 the spatial homogeneity of the VOx layer is removed at 800 K and a pattern consisting of macroscopic stripes develops; at elevated temperatures this pattern transforms into a pattern of circular VOx islands. Under reaction conditions the neighboring VOx islands become attracted by each other and coalesce. Similar processes of pattern formation and island coalescence are observed in catalytic CO oxidation. Reoxidation of the reduced VOx catalyst proceeds via surface diffusion of oxygen adsorbed onto Rh(111). A pattern consisting of macroscopic circular VOx islands can also be obtained by heating a Rh(111)/VOx catalyst in pure O2.
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Document Type: article
Publishing status: publishedVersion
Issue Date: 2016
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
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1 image of flag of Germany Germany 246 86.62%
2 image of flag of China China 11 3.87%
3 image of flag of United States United States 6 2.11%
4 image of flag of Congo Congo 5 1.76%
5 image of flag of Japan Japan 3 1.06%
6 image of flag of United Kingdom United Kingdom 3 1.06%
7 image of flag of No geo information available No geo information available 2 0.70%
8 image of flag of Hungary Hungary 2 0.70%
9 image of flag of Czech Republic Czech Republic 2 0.70%
10 image of flag of Korea, Republic of Korea, Republic of 1 0.35%
    other countries 3 1.06%

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