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  • 1
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Kinetik der Diffusion von Ethen in 4A-Zeolithen (1994)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 237-242 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Investigation on the Kinetics of Diffusion of Ethene on 4A ZeolitesThe kinetics of diffusion of ethene on 4A zeolites was examined. Conclusions on the transport mechanism were obtained by the loading dependence on the diffusion coefficients. Contrary to propene and the n-butene isomers, ethene can cross the windows to the cavities blocked up by Na+ ions in the NaA and Me0,22+Na0,8A zeolites (Me = Mg, Ca, Zn, Ba) by a translatory jump motion. In NaKA zeolites - by reason of additional blocking up of windows with K+ ions - the ethene molecules overcome the barrier only through the ethene/Na+(1) addition complexes.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19943360309
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Gleichgewichte der Ethenadsorption in 4A-Zeolithen (1994)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 58-62 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Equilibriums of Ethene Adsorption on 4A ZeolitesFrom the isotherms of ethene, measured on the zeolites NaA, K0,085Na0,915A and Me0,22+Na0,8 (Me = Mg, Ca, Zn, Ba) in the temperature range of 298 K to 353 K, the isosteric heats of adsorption and the partial molar entropies were calculated. All three quantities show a specific dependence on the loading. The exchanged univalent and divalent cations as adsorption centres have an essential influence on the shape of isotherms. The sequence of cations ordered according to highest adsorption heats depends also on the loading, caused by the different influence of the nonloaded and loaded divalent cations on the mobility and ionizity and therefore on the adsorption strength of the blocking Na+ cations.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19943360111
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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