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  • Scanning tunneling microscopy (STM)  (1)
  • surface alloys  (1)
  • surface restructuring  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Designing surface alloys with specific active sites (1996)
    Springer
    Catalysis letters 40 (1996), S. 131-135 
    Details
    ISSN: 1572-879X
    Schlagwort(e): active sites ; surface alloys ; STM ; molecular beams ; activation barriers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract This report describes a combined experimental and theoretical approach to the problem of designing surface alloys with specific chemical properties. Au-Ni(111) surface alloys were prepared and the distribution of active sites was determined by atomically resolved STM as a function of Au coverage. Using density functional theory the difference in activation energy for methane over the various sites was determined. The activity of the surface could be predicted directly by combining this information with the distribution of sites. Subsequent measurements of the activity proved this method to be quantitative and demonstrated that surface alloys with specific activity can be synthesized.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00815272
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Scanning tunneling microscopy characterization of ammonia synthesis catalysts (1991)
    Springer
    Catalysis letters 8 (1991), S. 273-282 
    Details
    ISSN: 1572-879X
    Schlagwort(e): Scanning tunneling microscopy (STM) ; ammonia synthesis catalysts ; surface chemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The possibility of studying the texture of catalysts at the atomic level by Scanning Tunneling Microscopy (STM) is demonstrated. It is shown that high resolution pictures can be obtained even for a passivated ammonia synthesis catalyst using a scanning tunneling microscope operating in air. The STM results reveal that the catalyst has a spongy pore structure with both hole and slit shaped pores. The catalyst surfaces are observed to contain fine quite regular ridge structures with a direction that tentatively is related to the (110) direction of iron. The presence of the ridge structures is apparently the result of the topotactic nature of the reduction process and a preference to expose (111) Fe facets.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00764189
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  • 3
    Digitale Medien
    Digitale Medien
    Direct observations of changes in surface structures by scanning tunneling microscopy (1994)
    Springer
    Topics in catalysis 1 (1994), S. 325-341 
    Details
    ISSN: 1572-9028
    Schlagwort(e): scanning tunneling spectroscopy (STM) ; surface reactions ; surface restructuring ; dynamics ; adsorbate-adsorbate interactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Recently, we have studied the interaction of reactive adsorbates H, C, O, and S with Ni and Cu surfaces by scanning tunneling microscopy (STM). In this paper, we briefly illustrate and discuss how such studies provide significant insight into the understanding of dynamic surface processes such as adsorbate-induced restructuring, surface reactions, and adsorbate-adsorbate interactions. The STM results demonstrate that there is a strong coupling between the chemisorption/reaction process and the distortion of the metal surface.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01492286
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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