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  • sulfated zirconia  (1)
  • unsaturated aldehydes  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Hydrogenation of substituted acrolein over alumina supported ruthenium catalysts (1993)
    Springer
    Catalysis letters 22 (1993), S. 189-195 
    Details
    ISSN: 1572-879X
    Keywords: Ruthenium ; bimetallics ; hydrogenation ; unsaturated aldehydes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The gas phase hydrogenation of acrolein, 2-methyl-2-propenal, 2-butenal and 3-methyl-2-butenal was studied on Ru/Al2O3 and RuM/Al2O3 catalysts (M=Sn, Fe, Zn, Ge, Sb). The specific activity increases when the second element is added to the parent Ru/Al2O3 catalyst. This was ascribed to the activation of the C=O bond by Mδ+ species. Tin is the only additive which promotes the allyl alcohol selectivity. When methyl groups are tagged on the C=C bond the selectivity to the unsaturated alcohol increased sharply due to the steric hindrance against the adsorption of the substrate via the C=C double bond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810365
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Infrared spectroscopy and microcalorimetry studies of CO adsorption on sulfated zirconia supported platinum catalysts (1996)
    Springer
    Catalysis letters 39 (1996), S. 197-203 
    Details
    ISSN: 1572-879X
    Keywords: sulfated zirconia ; platinum ; CO adsorption ; IR spectroscopy ; microcalorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Carbon monoxide adsorption has been investigated on Pt particles supported on a high surface area zirconia and sulfated zirconias. The accessibility of the Pt surface determined from the comparison of H2 chemisorption and transmission electron microscopy depends on two parameters: the temperature of treatment in air used to dehydroxylate sulfated zirconia, and the temperature of reduction. An oxidative pretreatment at 823 K yields a poor accessibility of Pt (0.03 〈 H/Pt 〈 0.05) whatever the temperature of reduction, whereas a Pt dispersion of 0.6 can be obtained by oxidation at 673 K followed by a mild reduction at 473 K. FTIR spectroscopy of adsorbed CO on Pt/ZrO2 shows besides the normal linear species at 2065 cm−1, a band at 1650 cm−1 which is attributed to CO bridged between Pt and Zr atoms. On Pt/ZrO2-SO 4 2− , all bridged species tend to disappear, as well as the dipole-dipole coupling andv CO is shifted by 57 cm−1 to higher frequencies. These results are attributed to sulfur adsorption on Pt which decreases the electron back-donation from Pt to the 2π * antibonding orbital of CO. The lower initial heat of CO adsorption observed on Pt/ZrO2-SO4/2− supports this proposal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00805583
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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