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Träfflista för sökning "WFRF:(Schmid C) srt2:(2005-2009)"

Sökning: WFRF:(Schmid C) > (2005-2009)

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  • Bosch, H, et al. (författare)
  • Needs transilation
  • 2008
  • Ingår i: GEBURTSHILFE UND FRAUENHEILKUNDE. - 0016-5751. ; 68:4, s. 425-425
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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  • Gustafson, Johan, et al. (författare)
  • Structure and catalytic reactivity of Rh oxides
  • 2009
  • Ingår i: Catalysis Today. - : Elsevier BV. - 0920-5861. ; 145:3-4, s. 227-235
  • Konferensbidrag (refereegranskat)abstract
    • Using a combination of experimental and theoretical techniques, we show that a thin RhO2 surface oxide film forms prior to the bulk Rh2O3 corundum oxide on all close-packed single crystal Rh surfaces. Based on previous reports, we argue that the RhO2 surface oxide also forms on vicinal Rh surfaces as well as on Rh nanoparticles. The detailed structure of this film was previously determined using UHV based techniques and density functional theory. In the present paper, we also examine the structure of the bulk Rh2O3 corundum oxide using surface X-ray diffraction. Being armed with this structural information, we have explored the CO oxidation reaction over Rh(1 1 1), Rh(1 0 0) and Pt25Rh75(1 0 0) at realistic pressures using in situ surface X-ray diffraction and online mass spectrometry. In all three cases we find that an increase of the CO2 production coincides with the formation of the thin RhO2 surface oxide film. In the case of Pt25Rh75(1 0 0), our measurements demonstrate that the formation of bulk Rh2O3 corundum oxide poisons the reaction, and argue that this is also valid for all other Rh surfaces. Our study implies that the CO oxidation reaction over Rh surfaces at realistic conditions is insensitive to the exact Rh substrate orientation, but is rather governed by the formation of a specific surface oxide phase. (C) 2008 Elsevier B.V. All rights reserved.
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  • Gustafson, Johan, et al. (författare)
  • Structure of a thin oxide film on Rh(100)
  • 2005
  • Ingår i: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 71:11
  • Tidskriftsartikel (refereegranskat)abstract
    • The initial oxidation of Rh(100) has been studied using high resolution core level spectroscopy, low energy electron diffraction, surface x-ray diffraction, scanning tunneling microscopy, and density functional theory. We report a structural study of an oxygen induced structure displaying a c(8x2) periodicity at an oxygen pressure above 10(-5) mbar and using a sample temperature of 700 K. Our experimental and theoretical data demonstrate that this structure is due to the formation of a thin surface oxide with a hexagonal trilayer O-Rh-O structure.
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  • Resultat 1-10 av 18

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