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

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dc.identifier.uri http://dx.doi.org/10.15488/810
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/834
dc.contributor.author Boehn, B. von
dc.contributor.author Preiss, A.
dc.contributor.author Imbihl, R.
dc.date.accessioned 2016-12-06T07:56:27Z
dc.date.available 2017-06-22T22:05:14Z
dc.date.issued 2016
dc.identifier.citation 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
dc.description.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. eng
dc.language.iso eng
dc.publisher Cambridge : Royal Society of Chemistry
dc.relation.ispartofseries Physical Chemistry Chemical Physics 18 (2016), Nr. 29
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
dc.subject photoemission electron microscopy (PEEM) eng
dc.subject Rh(111) eng
dc.subject physical chemistry eng
dc.subject.ddc 540 | Chemie ger
dc.title Dynamics of ultrathin V-oxide layers on Rh(111) in catalytic oxidation of ammonia and CO
dc.type article
dc.type Text
dc.relation.essn 1463-9084
dc.relation.issn 1463-9076
dc.relation.doi http://dx.doi.org/10.1039/C6CP03637F
dc.bibliographicCitation.issue 29
dc.bibliographicCitation.volume 18
dc.bibliographicCitation.firstPage 19713
dc.bibliographicCitation.lastPage 19721
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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