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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents



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ID: 435588.0, Fritz-Haber-Institut / Inorganic Chemistry
Oscillatory behavior in the CO-oxidation over bulk ruthenium dioxide – the effect of the CO/O2 ratio
Authors:Rosenthal, Dirk; Girgsdies, Frank; Timpe, Olaf; Weinberg, Gisela; Schlögl, Robert
Language:English
Research Context:CO-oxidation over oxygenated Ruthenium
Date of Publication (YYYY-MM-DD):2011
Title of Journal:Zeitschrift für Physikalische Chemie
Journal Abbrev.:Z. Phys. Chem.
Volume:225
Start Page:57
End Page:68
Copyright:© by Oldenbourg Wissenschaftsverlag, München
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:CO oxidation over polycrystalline ruthenium dioxide was monitored in an in-situ XRD setup. The evolution of the bulk state of the catalyst was followed by in-situ XRD during reaction, while the surface morphology and chemical state before and after reaction were investigated by HRSEM and EDX. The commercial RuO2 powder was calcined prior reaction to ensure the formation of completely oxidized RuO2. This pre-calcined RuO2 is initially inactive in CO oxidation regardless of the CO/O2 feed ratio and requires an induction period, the length of which strongly depends whether the catalyst is diluted with boron nitride or not. After this induction period oscillations in the CO2 yield occur under O2-rich conditions only. These oscillations exhibit two time constants for the diluted catalyst, while the low frequency oscillations were not observed in the case of undiluted RuO2. Furthermore, the state of the catalyst after activation in O2-rich feed conditions differs dramatically from the state after activation in CO-rich feed conditions. Firstly, the catalyst activated in an O2-rich atmosphere remains inactive under CO-rich conditions in contrast to the catalyst activated in CO-rich conditions which is afterwards active under all feed ratios examined. Secondly, the surface morphology of the catalyst is quite different. While the apical surfaces of the RuO2 crystals become roughened upon activation in the CO-rich feed, they become facetted under O2 rich activation conditions. Therefore, we conclude that at least two different active surface states on the bulk RuO2 catalyst exist.
Free Keywords:Ruthenium; CO oxidation; faceting; oscillations
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Electronic Structure and Adsorption / Metals
Fritz-Haber-Institut/Inorganic Chemistry/Nanostructures
Fritz-Haber-Institut/Inorganic Chemistry/Micro- and Nanostructure / Carbon
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
Identifiers:URL:http://dx.doi.org/10.1524/zpch.2011.5515 [only for subscriber]
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