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Stoeckli, Fritz

Nom
Stoeckli, Fritz
Affiliation principale
Fonction
Professeur.e émérite
Email
fritz.stoeckli@unine.ch
Identifiants
https://libra.unine.ch/handle/123456789/471

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  • Publication
    Accès libre
    Recent Developments in the Dubinin Equation
    (1989)
    Stoeckli, Fritz 
    ;
    Kraehenbuehl, Francis
    ;
    Ballerini, L.
    ;
    De Bernardini, S.
    A combination of techniques—mainly immersion calorimetry and adsorption from the vapor phase—provides independent data for the assessment of micropore sizes and their distribution in relation to parameters E0 and n of the Dubinin-Astahhov (D-A) equation. It is shown that carbons described by the Dubinin-Radushkevich (D-R) equation (n = 2) present some heterogeneity, which can be expressed in terms of contributions from true molecular-sieve carbons with n = 3.
  • Publication
    Accès libre
    A comparison of experimental and theoretical adsorption kinetics of dichloromethane vapour by active carbon under non-isothermal conditions
    (1988)
    Meunier, Francis
    ;
    Sun, Lian-Ming
    ;
    Kraehenbuehl, Francis
    ;
    Stoeckli, Fritz 
    The kinetics of the adsorption of dichloromethane vapour by a typical active carbon have been measured at 288 and 323K and for spherical granules of 0.25 and 1.0 mm in diameter. The data have been analysed within the framework of a model for adsorption by bidispersed systems and under non-isothermal conditions. Micropore diffusion is the rate-controlling step, and direct measurements show that the process is not isothermal. However, thermal effects do not seem to influence significantly the kinetics of adsorption. Good agreement can be found between experimental and calculated data, and the model leads to micropore diffusivities and heat-transfer coefficients for the system under investigation.
  • Publication
    Accès libre
    The Relation between Immersion Calorimetry and the Parameters of the Water Adsorption Isotherm on Active Carbons
    (1986)
    Kraehenbuehl, Francis
    ;
    Quellet, Christian
    ;
    Schmitter, Beat
    ;
    Stoeckli, Fritz 
    It is shown that for active carbons with a single type of hydrophilic adsorption sites, the enthalpy of immersion into water is related to the number of sites, a0, and to a parameter, c, both of which appear in the Dubinin–Serpinskii equation for the water adsorption isotherm. The correlation was established on the basis of data for 13 different active carbons whose sites were either acidic or of the carbonyl type. It follows that the adsorption branch of the water isotherm can be calculated from data based on the enthalpy of immersion and the micropore volume.
  • Publication
    Accès libre
    The Characterization of Natural and Artificial Calcium Carbonates by Adsorption and Immersion Techniques
    (1985)
    Morel, Daniel
    ;
    Stoeckli, Fritz 
    ;
    Kraehenbuehl, Francis
    ;
    Misteli, Laurent
    ;
    Munyazikwiye, Paulin
    Nitrogen adsorption isotherms at 77K and enthalpies of immersion into water at 293K have been measured for a series of artificial and natural calcium carbonates. It appears that the external surface area and the micropore system can be fully characterized if a non-porous sample, present in the series, is used as an internal reference. Data are given for the reference isotherm. Owing to high specific interactions, immersion into water only provides information on the total surface area of the samples.