Catalytically active states of Ru(0001) catalyst in CO oxidation reaction

Blume, Raoul; Hävecker, Michael; Zafeiratos, Spyridon; Teschner, Detre; Kleimenov, Evgueni; Knop‐Gericke, Axel; Schlögl, Robert; Barinov, A.; Dudin, Pavel; Kiskinova, M.

doi:10.1016/j.jcat.2006.02.019

Cited by 89 publications

(108 citation statements)

References 30 publications

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“…Two additional components at 286.0 and 288.2 ± 0.2 eV are assigned to oxygen bound carbon species; alcohol/carbonyl groups and formate groups respectively [23], [24] and [25]. The Ru 3d 5/2 peak at 280.0 eV is very close to the binding energy previously measured on clean metallic Ru (0 0 0 1) in the same set-up [26]. The Co 2p 3/2 peak (solid black line) shown in Fig.…”

Section: Comparison Of Srm and Wgs Reactions Over Ptruco Catalystsupporting

confidence: 80%

A comparative in situ XPS study of PtRuCo catalyst in methanol steam reforming and water gas shift reactions

et al. 2010

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In the present study the oxidation state and the surface composition of a ternary PtRuCo catalyst were investigated under methanol steam reforming (SRM) and water gas shift (WGS) reaction conditions at 570 K. Ambient pressure X-ray photoelectron spectroscopy (APPES) was applied in situ at 0.5 mbar, while simultaneously monitoring the catalytic activity of the sample by on-line mass spectrometry. Non-destructive depth profile measurements performed under SRM reaction conditions over a polycrystalline PtCo foil, were also used to obtain detailed depth-resolved information. The results showed that surface segregation of cobalt and modification of its oxidation state occurs when switching from SRM to WGS reaction conditions. Evidence of ionic Pt was found only during WGS reaction, while Ru was mainly present in the metallic state. The results clearly demonstrate the dynamic response of the PtRuCo catalytic surface to the reaction atmosphere.

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Section: Comparison Of Srm and Wgs Reactions Over Ptruco Catalystsupporting

confidence: 80%

A comparative in situ XPS study of PtRuCo catalyst in methanol steam reforming and water gas shift reactions

et al. 2010

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“…Ruthenium shows interesting catalytic properties for a number of industrially relevant applications including CO oxidation 1 and ammonia synthesis. 2,3 In particular, the latter has attracted much attention due to ruthenium's activity at significantly lower temperatures than traditional Haber−Bosch synthesis.…”

Section: ■ Introductionmentioning

confidence: 99%

Far-IR Spectra and Structures of Small Cationic Ruthenium Clusters: Evidence for Cubic Motifs

et al. 2015

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1021/jp510471kAccess and use of this website and the material on it are subject to the Terms and Conditions set forth at NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=0f5a9b5b-c1a7-46b4-9345-7e97f15ffc33 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=0f5a9b5b-c1a7-46b4-9345-7e97f15ffc33 ABSTRACT: Far-IR vibrational spectra of small ruthenium cluster cations (Ru 7 + , Ru 8 + , and Ru 9 + ) are measured via infrared multiple photon dissociation (IR-MPD) spectroscopy using Ar atoms as messenger for the absorption. These spectra are compared to results from density functional theory calculations, leading to structural assignments. The pure functional PBE leads to better agreement with the experimental data compared to the hybrid functional PBE0. For all three cluster sizes the structures assigned are based on a cubic motif and are a distorted cube missing one corner atom (Ru 7 + ), a slightly distorted cube (Ru 8 + ), and a face-capped cube (Ru 9 + ).

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“…The O-TM-O trilayer structure has been shown to be an important surface oxide phase upon oxidation of TM surfaces. [25][26][27][28] The structural transformation between these surface oxide phases may exhibit a strong influence on oxide catalysis, which is worth exploring in detail. Using the FeO x -Pt inverse catalytic system, we have shown that metastable FeO bilayer nanostructures can be stabilized on Pt surfaces via the confinement effect exerted by the noble metal surfaces.…”

Section: Introductionmentioning

confidence: 99%

Reversible structural transformation of FeOx nanostructures on Pt under cycling redox conditions and its effect on oxidation catalysis

Yao

Guo

et al. 2013

Phys. Chem. Chem. Phys.

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a Understanding dynamic changes of catalytically active nanostructures under reaction conditions is a pivotal challenge in catalysis research, which has been extensively addressed in metal nanoparticles but is less explored in supported oxide nanocatalysts. Here, structural changes of iron oxide (FeO x ) nanostructures supported on Pt in a gaseous environment were examined by scanning tunneling microscopy, ambient pressure X-ray photoelectron spectroscopy, and in situ X-ray absorption spectroscopy using both model systems and real catalysts. O-Fe (FeO) bilayer nanostructures can be stabilized on Pt surfaces in reductive environments such as vacuum conditions and H 2 -rich reaction gas, which are highly active for low temperature CO oxidation. In contrast, exposure to H 2 -free oxidative gases produces a less active O-Fe-O (FeO 2 ) trilayer structure. Reversible transformation between the FeO bilayer and FeO 2 trilayer structures can be achieved under alternating reduction and oxidation conditions, leading to oscillation in the catalytic oxidation performance.

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Catalytically active states of Ru(0001) catalyst in CO oxidation reaction

Cited by 89 publications

References 30 publications

A comparative in situ XPS study of PtRuCo catalyst in methanol steam reforming and water gas shift reactions

A comparative in situ XPS study of PtRuCo catalyst in methanol steam reforming and water gas shift reactions

Far-IR Spectra and Structures of Small Cationic Ruthenium Clusters: Evidence for Cubic Motifs

Reversible structural transformation of FeOx nanostructures on Pt under cycling redox conditions and its effect on oxidation catalysis

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