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  • KF2Mn(CO)12 as catalyst precursor  (1)
  • Pt/Al2O3  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Variable temperature13C MAS NMR of KFe2Mn(CO)12 in the solid state and as aCatalyst precursor on a carbon support (1989)
    Springer
    Catalysis letters 2 (1989), S. 413-422 
    Details
    ISSN: 1572-879X
    Schlagwort(e): Nuclear magnetic resonance for catalyst characterization ; KF2Mn(CO)12 as catalyst precursor
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Variable temperature13C MAS NMR spectra are reported for13CO-enriched KFe2Mn(CO)12 as a solid and also as dispersed clusters on a carbon support. The spectrum of KFe2Mn(CO)12 at 300 K agrees with the proposed structure for this cluster and shows that the cluster is static. Two bridging carbonyl resonances are clearly resolved and, by comparison with13C MAS NMR spectra of Mn2(CO)10 and Fe2(CO)9, all terminal resonances for the cluster can be assigned. When the cluster is supported on carbon, two broad resonances are observed at room temperature which are assignable to KFe2Mn(CO)12 and a decomposition product, Mn2(CO)10. The carbonyl ligands in both supported clusters are completely averaged, and KFe2Mn(CO)12 on the carbon surface demonstrates fluxional behavior similar to that observed for the cluster in solution. For this fluxional process, activation energies of 0.6 kcal/mol and 0.5 kcal/mol are estimated for carbon-supported KFe2Mn(CO)12 and Mn2(CO)10, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00768184
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019156726267
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