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  • Mössbauer spectroscopy  (1)
  • Pt/SiO2  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Olefin selective carbon-supported K-Fe-Mn CO hydrogenation catalysts: A kinetic, calorimetric, chemisorption, infrared and Mössbauer spectroscopic investigation (1990)
    Springer
    Catalysis letters 7 (1990), S. 219-240 
    Details
    ISSN: 1572-879X
    Schlagwort(e): Carbon supported Fe ; Fe-Mn ; K-Fe-Mn catalysts ; mixed metal carboxyl clusters ; chemisorption ; kinetic measurements ; calorimetric measurements ; infrared spectroscopy ; Mössbauer spectroscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Carbon-supported Fe, Fe-Mn, and K-Fe-Mn catalysts derived from stoichiometric mixed-metal carbonyl clusters were pretreated at either 473 K or 673 K in hydrogen. Chemisorption and kinetic measurements were conducted following these pretreatments. The iron remained highly dispersed at all times except after high temperature reductions when potassium was present. The single promotion by either Mn or K increases the olefin/paraffin ratio, while the doubly promoted catalyst gave very high selectivities for light olefins. Isothermal, integral heats of adsorption of CO were determined at 300 K, and they increased from 15 kcal/mole for Fe3/C to nearly 17 kcal/mole for both the singly promoted Fe2Mn/C and KFe3/C catalysts to 21 kcal/mole for the doubly promoted KFe2Mn/C sample. A model of the decomposition of these carbonyl clusters is proposed based on calorimetric, Mössbauer effect spectroscopic and diffuse reflectance Fourier transform infrared spectroscopic studies. The state of the MnOx and K phases on the iron surface, as well as the Fe crystallite size, appears to play a dominant role in determining the catalytic behavior.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00764505
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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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