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  • 1
    Electronic Resource
    Electronic Resource
    Scanning tunneling microscopy characterization of ammonia synthesis catalysts (1991)
    Springer
    Catalysis letters 8 (1991), S. 273-282 
    Details
    ISSN: 1572-879X
    Keywords: Scanning tunneling microscopy (STM) ; ammonia synthesis catalysts ; surface chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764189
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Keywords: scanning tunneling spectroscopy (STM) ; surface reactions ; surface restructuring ; dynamics ; adsorbate-adsorbate interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01492286
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    Paper (German National Licenses)
    Fulltext
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