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  • 1995-1999  (2)
  • Rh/SiO2  (1)
  • benzyl alcohol  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The influence of MSI (metal–support interactions) on activity and selectivity in the hydrogenation of aldehydes and ketones (1997)
    Springer
    Topics in catalysis 4 (1997), S. 241-248 
    Details
    ISSN: 1572-9028
    Keywords: Pt catalysts ; SMSI ; TiO2-supported Pt ; Pt/TiO2 ; Pt/SiO2 ; Pt/Al2O3 ; hydrogenation of: crotonaldehyde ; benzaldehyde ; phenylacetaldehyde ; acetophenone ; acetone ; butyraldehyde ; benzyl alcohol ; 1–phenylethanol ; acetylcyclohexane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The vapor–phase hydrogenation of a group of aldehydes and ketones which contain unsaturated C=C bonds has been studied over a family of supported Pt catalysts. Turnover frequencies, activation energies and reaction orders for crotonaldehyde, benzaldehyde, phenylacetaldehyde and acetophenone are provided and compared to those for butyraldehyde, benzyl alcohol, 1–phenylethanol, acetylcyclohexane and acetone. Metal–support interactions (MSI) induced in Pt/TiO2 not only enhance specific activity but also markedly shift selectivity because hydrogenation of the carbonyl bond is favored. The retention of high selectivity to the intermediate unsaturated alcohols shows that adsorption properties, as well as kinetic parameters, are altered. A model is discussed which describes the sites responsible for this behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019156726267
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    CO2 reforming of methane over vanadia-promoted Rh/SiO2 catalysts (1999)
    Springer
    Topics in catalysis 8 (1999), S. 211-222 
    Details
    ISSN: 1572-9028
    Keywords: reforming ; methane ; carbon dioxide ; Rh/SiO2 ; vanadia-promoted Rh/SiO2 ; FTIR spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reforming of methane with carbon dioxide over rhodium dispersed on silica, Rh/SiO2, and vanadia-promoted silica, Rh/VOx/SiO2, was studied by kinetic test reactions under differential conditions in a temperature range from 723 to 773 K. Transmission infrared spectroscopy was applied to observe the interaction of CO2 with the catalysts and the formation of surface intermediates during the CO2–CH4 reforming reaction. To analyze carbon deposition XP spectroscopy and TPO was carried out. It has been shown that the promotion of Rh/SiO2 catalysts with vanadium oxide enhances the catalytic activity for CO2 reforming of methane and decreases the deactivation by carbon deposition. This is attributed to the formation of a partial VOx overlayer on the Rh surface, which reduces the size of accessible ensembles of Rh atoms required for coke formation and creates new sites at the Rh–VOx interfacial region that are considered to be active sites for the activation/dissociation of carbon dioxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019121429843
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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