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  • 1
    Electronic Resource
    Electronic Resource
    Designing surface alloys with specific active sites (1996)
    Springer
    Catalysis letters 40 (1996), S. 131-135 
    Details
    ISSN: 1572-879X
    Keywords: active sites ; surface alloys ; STM ; molecular beams ; activation barriers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00815272
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    Paper (German National Licenses)
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  • 2
    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
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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