ALBERT

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  • 1
    Electronic Resource
    Electronic Resource
    Benzoylation of toluene with benzoyl chloride on Al‐promoted sulfated solid superacids (1998)
    Springer
    Catalysis letters 55 (1998), S. 105-112 
    Details
    ISSN: 1572-879X
    Keywords: sulfated zirconia ; sulfated titania ; promoting effect of Al ; superacidity ; benzoylation of toluene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The catalytic performance of Al‐promoted sulfated zirconia and sulfated titania for benzoylation of toluene with benzoyl chloride has been investigated. The incorporation of Al enhances the catalytic activity of the sulfated oxide catalysts prominently owing to an increase in superacidity of the catalysts. Al‐promoted sulfated zirconia catalysts are more active than the analogous sulfated titania catalysts because of their higher superacidity. In particular, SO4 2-–/3%Al2O3–ZrO2 is a good clean catalyst for the benzoylation reaction, which gives 100% yield of methylbenzophenones after on stream for 12 h at 110 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019014408286
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  • 2
    Electronic Resource
    Electronic Resource
    New catalyst of SO 4 2− /Al2O3–ZrO2 for n-butane isomerization (1998)
    Springer
    Topics in catalysis 6 (1998), S. 101-106 
    Details
    ISSN: 1572-9028
    Keywords: butane isomerization ; sulfated zirconia ; SO 4 2− /Al2O3–ZrO2 ; acid strength distribution ; promoting effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The catalytic behavior of Al-promoted sulfated zirconia for n-butane isomerization at low temperature in the absence of H2 and at high temperature in the presence of H2 was studied. The addition of Al enhances the activity and stability of the catalysts for reaction at 250°C and in the presence of H2 significantly. After on stream for 120 h, the n-butane conversion of the catalyst containing 3 mol% Al2O3 keeps steadily at 88% of its equilibrium conversion and no observable trend of further deactivation has been observed. The difference in behavior of the promoted and unpromoted catalysts at low and high temperature is associated with a change of reaction mechanism from bimolecular to monomolecular. Experimental evidence is presented to show that the promoting effect of Al is different from that of the transition metals. Microcalorimetric measurements of NH3 adsorption on catalysts reveal that the remarkable activity and stability of the Al-promoted catalysts are caused by an enhancement in the number of acid sites effective for the isomerization reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019122608037
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