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  • Electronic Resource  (3)
  • DRS  (1)
  • EPR-DRS  (1)
  • bifunctional catalysis  (1)
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  • Electronic Resource  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Factors influencing the catalytic activity of titanium silicalites in selective oxidations (1991)
    Springer
    Catalysis letters 8 (1991), S. 237-244 
    Details
    ISSN: 1572-879X
    Keywords: Titanium silicalite ; oxidation catalyst ; hydrogen peroxide adsorption ; IR ; DRS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Titanium silicalites synthesized via different procedures are tested in the oxidation of phenol, l-octene and n-hexane by aqueous H2O2. It is shown that the presence of titanyl groups, on which H2O2 is activated by formation of titanium peroxo complexes, is a prerequisite for oxygenation activity. Furthermore, in order to afford high selectivities, titanium silicalites should be free of impurities which cause acid catalyzed side reactions or H2O2 decomposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764122
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanism of the paring reaction of naphtenes (1996)
    Springer
    Catalysis letters 37 (1996), S. 207-212 
    Details
    ISSN: 1572-879X
    Keywords: bifunctional catalysis ; paring reaction ; 1-cyclohexyloctane ; naphtenes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract 1-cyclohexyloctane is isomerized on the large pore, bifunctional zeolite catalyst Pt/H-Y. The detailed isomerization mechanism of this naphtene molecule is revealed through a thorough analysis of the numerous isomerization products. It is found that methyl side-chains are generated on the ring of the molecule via a ring contraction-expansion mechanism, which are subsequently transferred to then-alkyl substituent via methyl shifts. Direct branching of then-alkyl chain is a much slower process compared to the generation of methyl substituents on the ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807755
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Oxidation catalysis with well-characterised vanadyl bis-bipyridine complexes encapsulated in NaY zeolite (1996)
    Springer
    Topics in catalysis 3 (1996), S. 437-449 
    Details
    ISSN: 1572-9028
    Keywords: oxidation catalysis ; zeolite ; vanadium complex ; XPS-CA ; EPR-DRS ; IR-Raman
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Vanadyl exchanged faujasite (VO2+-NaY) allows bipyridine complexation, giving a heterogeneous“ship-in-a-bottle” catalyst denoted as [VO(bpy)2]2+-NaY. The [VO(bpy)2]2+ complexes associated with the zeolite are characterised with FT-Raman, FT-IR, XPS, and diffuse reflectance spectroscopy (DRS), as well as with electron paramagnetic resonance (EPR). It is established that the cationic complexes are intrazeolitic and homogeneously distributed across the zeolite crystals and both the zeolite and the neutral bipyridine ligands stabilise VIV. The catalytic oxidation of cyclohexane and cyclohexene with different peroxides or mono-oxygen atom donors in presence of several solvents is described. Good epoxide selectivity results from the complexation by bipyridine thus favoring the heterolytic over the homolytic decomposition pathway of V-peroxo-intermediates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02113866
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    Paper (German National Licenses)
    Fulltext
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