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  • Articles  (2)
  • acrylonitrile  (1)
  • relative likelihood  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A new ternary mixed oxide catalyst for ammoxidation of propane: Sn/V/Sb (1998)
    Springer
    Catalysis letters 50 (1998), S. 17-23 
    Details
    ISSN: 1572-879X
    Keywords: acrylonitrile ; ternary mixed oxide ; tin ; vanadium ; antimony
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The catalytic properties of a Sn/V/Sb mixed oxide for propane ammoxidation to acrylonitrile are studied in this paper. In particular the antimony and vanadium amounts were changed in order to optimize the relative atomic ratio. The ternary sample with the best catalytic performance was compared with the analogous binary samples (Sn/Sb and Sb/V). The results obtained indicate that vanadium is responsible for the paraffin activation, nevertheless much vanadium produces a lot of carbon oxides. Antimony is responsible for the insertion of nitrogen in the molecule (it can be considered as an acrylonitrile selectivity modulator); nevertheless, too much antimony deactivates the catalyst. Tin does not act only as a dispersive matrix for the active sites, but leads to the formation of a polyfunctional catalyst, increasing the rate of acrylonitrile formation from the intermediate propene. From a structural point of view, this catalytic system can be described as a homogeneous system, containing microfields of rutile type oxide (SnO2), promoted with antimony and vanadium in substitutional solid solution, dispersed in an excess of amorphous antimony oxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019046430749
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  • 2
    Electronic Resource
    Electronic Resource
    A proposal for comparing the reliabilities of alternative seismic hazard models (1998)
    Springer
    Journal of seismology 2 (1998), S. 27-35 
    Details
    ISSN: 1573-157X
    Keywords: relative likelihood ; Bayesian approach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Differences between statistical unertainty and modeling uncertainty are briefly discussed. It is pointed out that, when different models are proposed for the interpretation of reality, the uncertainty cannot be described in terms of mean value and coefficient of variation. The important question is: which of the proposed models is more reliable than the others? The attention, then, is concentrated on the comparison between different models proposed for the estimate of the required quantity, looking for a criterion leading to the selection of the most reliable one. A criterion for comparison of different models is suggested. In the example of application considered in this paper, it proved to be effective, so that the continuation of numerical experiments, exploring different and more complex situations, seems promising.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009779806984
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    Paper (German National Licenses)
    Fulltext
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