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  • 1
    Electronic Resource
    Electronic Resource
    Activity coefficients of adsorbed mixtures (1995)
    Springer
    Adsorption 1 (1995), S. 103-112 
    Details
    ISSN: 1572-8757
    Keywords: adsorption ; mixtures ; activity coefficients ; zeolites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Experimental and simulated data for adsorption of gas mixtures on energetically heterogeneous surfaces like activated carbon and zeolites exhibit negative deviations from ideality. The deviations are large in some cases, with activity coefficients at infinite dilution equal to 0.1 or less. Similar molecules form ideal mixtures, but molecules of different size or polarity are nonideal. Equations for bulk liquid mixtures (Wilson, Margules, etc.) do not apply to isobars for adsorbed mixtures. A two-constant equation for activity coefficients as a function of composition and spreading pressure is in good agreement with theory, simulation, and experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00704999
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of Experimental Techniques for Measuring Isosteric Heat of Adsorption (2000)
    Springer
    Adsorption 6 (2000), S. 275-286 
    Details
    ISSN: 1572-8757
    Keywords: sorption heats ; calorimetry ; isosteric technique ; zeolites ; gases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Experimental measurements of heats of adsorption published in the literature are often in disagreement; differences of 10–20% are common. The three most widely used experimental methods are: (1) differentiation of adsorption isotherms at constant loading; (2) measurement of adsorption isosteres; (3) calorimetry. Results from these methods were compared for the systems nitrogen on CaA, oxygen on CaA, and carbon dioxide on NaX. Although the same materials and similar degassing procedures were used for all experiments, calorimetric heats are about 2 kJ/mol higher than the heats from isoteric measurements. Additional experiments are needed to bring these methods into exact agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026551213604
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    Paper (German National Licenses)
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