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  • 1990-1994  (2)
  • nickel  (1)
  • surface acidity  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Enhancement of surface acidity and catalytic activity by glass formation of calcium metaphosphate (1991)
    Springer
    Catalysis letters 11 (1991), S. 49-53 
    Details
    ISSN: 1572-879X
    Schlagwort(e): Calcium metaphosphate glass ; surface acidity ; catalytic activity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Effective acid sites for the dehydration of 2-propanol and isomerization of 1-butene were found to be generated by glass formation of calcium metaphosphate. The number of these sites with strong acidity remarkably decreased by the crystallization of the glass, where the condensation of hydroxyl groups were significant. Thus, the sites must be the monohydrogen phosphate protons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00866900
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Effect of hydrogen on carbon deposition from carbon monoxide on nickel catalyst (1994)
    Springer
    Catalysis letters 23 (1994), S. 237-243 
    Details
    ISSN: 1572-879X
    Schlagwort(e): Carbon deposition ; hydrogen effect ; nickel
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The role of hydrogen in carbon deposition on Ni has been studied at H2/CO 〈 1 and 698 K by determining the respective rates of the carbon-forming reactions: (1) CO + H2 →-C + H2O and (2) 2CO → C + CO2. The steady-state rate of reaction (1) increases in proportion to H2 pressure. On the other hand, reaction (2) is facilitated by the addition of an extremely small amount of H2, so that the rate becomes about eight times that for pure CO but hardly varies as more H2 is added. Similarly, there is a great difference in catalytic activity for ethylene hydrogenation between spent catalysts obtained in the deposition with and without H2. These findings suggest that hydrogen, even in a small amount, makes free Ni surface area larger than for pure CO.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00811358
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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