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  • 1
    Digitale Medien
    Digitale Medien
    Effect of Pretreatment on Surface Area, Porosity, and Adsorption Properties of a Carbon Black (1995)
    s.l. : American Chemical Society
    Chemistry of materials 7 (1995), S. 754-763 
    Details
    ISSN: 1520-5002
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/cm00052a022
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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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  • 3
    Digitale Medien
    Digitale Medien
    Furfural hydrogenation over carbon‐supported copper (1999)
    Springer
    Catalysis letters 60 (1999), S. 51-57 
    Details
    ISSN: 1572-879X
    Schlagwort(e): furfural hydrogenation ; Cu/carbon catalysts ; kinetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Furfural hydrogenation over copper dispersed on three forms of carbon – activated carbon, diamond and graphitized fibers – were studied. Only hydrogenation of the C=O bond to form either furfuryl alcohol or 2‐methyl furan occurred at temperatures from 473 to 573 K. Reduction at 573 K gave the most active catalysts, all three catalysts had activation energies of 16 kcal/mol, and turnover frequencies were 0.018–0.032 s-1 based on the number of Cu0 + Cu+ sites, which were counted by N2O adsorption at 363 K and CO adsorption at 300 K, respectively. The Cu/activated carbon catalyst showed no deactivation during 10 h on stream, in contrast to the other two catalysts. A simple Langmuir–Hinshelwood model invoking two types of sites was able to fit all kinetic data quite satisfactorily, thus it was consistent with the presence of both Cu0 and Cu+ sites.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019090520407
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  • 4
    Digitale Medien
    Digitale Medien
    CO2 reforming of methane over vanadia-promoted Rh/SiO2 catalysts (1999)
    Springer
    Topics in catalysis 8 (1999), S. 211-222 
    Details
    ISSN: 1572-9028
    Schlagwort(e): reforming ; methane ; carbon dioxide ; Rh/SiO2 ; vanadia-promoted Rh/SiO2 ; FTIR spectroscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019121429843
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  • 5
    Digitale Medien
    Digitale Medien
    Book Review: Handbook of Heterogeneous Catalysis. By G. Ertl, H. Knözinger, and J. Weitkamp (1997)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 36 (1997), S. 2690-2691 
    Details
    ISSN: 0570-0833
    Schlagwort(e): Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/anie.199726901
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