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  • ultrafine Pd particle  (2)
  • DCDPS  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Thermal degradation of sulfone-containing polyarylates (1994)
    Springer
    Journal of polymer research 1 (1994), S. 211-214 
    Details
    ISSN: 1572-8935
    Schlagwort(e): Polyarylate ; Bisphenol-A ; DCDPS ; IPA ; TGA ; Thermal degradation ; Lifetime
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Abstract Polyarylates were prepared from direct polycondensation of aromatic dicarboxylic acid such as 4,4'-dicarboxy diphenyl sulfone (DCDPS), isophthalic acid (IPA), and bisphenol-A (SPA) by means of ptoluenesulfonyl chloride and DMF in pyridine. We used thermogravimetric analysis to investigate the thermal decomposition of polyarylates and to determine kinetic parameters such as activation energy, preexponential factor and reaction order. Such information is useful for quick estimation of polymer lifetimes. Polyarylate derived from DCDPS-BPA has a longer lifetime than DCDPS/IPA-BPA or IPA-BPA at any given temperature, indicating that the former has better thermal stability than the latter.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01374097
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Structural change of palladium particles supported on cerium oxide in catalytic methanol synthesis (2000)
    Springer
    Catalysis letters 68 (2000), S. 181-183 
    Details
    ISSN: 1572-879X
    Schlagwort(e): methanol synthesis ; palladium supported on ceria ; ultrafine Pd particle ; formation of Pd–O–Ce ; EXAFS of Pd K-edge
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Ultrafine palladium particles supported on cerium oxide by the coprecipitation method effectively catalyzes the methanol synthesis from carbon monoxide and hydrogen, while the catalytic activity increases in the initial stage. The Pd K-edge EXAFS (extended X-ray absorption fine structure) of the catalyst shows that a small part of palladium is still oxidized after the pretreatment with hydrogen at 573 K for 1 h. During the reaction the palladium particles in the catalyst are further oxidized due to the formation of Pd–O–Ce bonding which may stabilize the cationic palladium species being active to the reaction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019099823810
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Methanol synthesis from carbon monoxide and hydrogen catalyzed over Pd/CeO2 prepared by the deposition–precipitation method (2000)
    Springer
    Catalysis letters 64 (2000), S. 23-25 
    Details
    ISSN: 1572-879X
    Schlagwort(e): methanol synthesis ; palladium supported on ceria ; cationic palladium ; ultrafine Pd particle ; EXAFS of Pd ; XPS of Pd 3d
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Ceria‐supported palladium catalysts prepared by the deposition–precipitation method are highly active for the methanol synthesis from carbon monoxide and hydrogen in comparison with the catalyst prepared by the conventional impregnation method. Analyses by EXAFS show that palladium particles can be dispersed very well on the surface of ceria by both the methods, implying that the higher activity of the catalysts prepared by deposition–precipitation is not simply due to the particle size of palladium. Cationic palladium species are present in the samples prepared by deposition–precipitation after reduction with hydrogen at 300 °C, suggesting that the active species are produced by strong contact between palladium particles and the support.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019070516657
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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