Concerning adsorptional properties of carbon adsorbents 3. A study of adsorption isotherms of gases and vapors on active carbons over a wide interval of temperatures, including the critical region

  • K. M. Nikolaev
  • M. M. Dubinin
Physical Chemistry


  1. 1.

    The adsorption isotherms of nitrogen, krypton, xenon, tetrafluoroethylene and hexafluoropropylene were studied over a wide temperature interval, including the critical region, with two specimens of active carbon which belonged to the extreme members of the series of active carbons of the first structrual type.

  2. 2.

    As a result of the analysis of experimental data and of the examination of the peculiarities of the state of adsorbed substances in the region of the critical temperature, rational methods of calculation were proposed for the characteristic curve from adsorption isotherms of the substances in gaseous and vapor states.

  3. 3.

    In accord with the potential theory of adsorption, the affinity coefficients of the characteristic curves do not depend on the structure of the carbon, while the limiting volumes of the adsorptional space are constant magnitudes for each active carbon, provided that the effect of ultraporosity is not manifested.

  4. 4.

    Equations of the adsorption isotherms for active carbons of the first structural type were proposed for gaseous and vapor states of the substances being adsorbed in the equilibrium space phase, these equations corresponding to the same equation of the characteristic curve. These equations of adsorption isotherms were supported experimentally.



Active Carbon Adsorption Isotherm Critical Temperature Xenon Critical Region 
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Copyright information

© Consultants Bureau Inc. 1959

Authors and Affiliations

  • K. M. Nikolaev
    • 1
  • M. M. Dubinin
    • 1
  1. 1.Institute of Physical Chemistry of the Academy of Sciences USSRUSSR

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