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Adsorption of water vapors and micropore structures of carbon adsorbents. 16. Comparative method of analysis of the structure of carbon adsorbents

  • Physical Chemistry
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Bulletin of the Academy of Sciences of the USSR, Division of chemical science Aims and scope

Conclusions

  1. 1.

    A method for analyzing the structure of active carbons based on a comparison of the isotherms of adsorption of water vapors on porous and nonporous carbon adsorbents was proposed. The method permits calculating the number of primary adsorption sites, estimating the size of the micropores, and analyzing the mechanism of pore volume filling.

  2. 2.

    The initial segments of the comparative graphs are straight lines which pass through the origin, and their slope is proportional to the number of primary adsorption sites.

  3. 3.

    The deviation of the comparative graphs from the linear dependence upward takes place earlier the smaller the pore size. The intensification of adsorption of water vapors in the micropores of active carbons in comparison to nonporous carbon blacks is due to the mutual effect of the primary adsorption sites and adsorbed molecules of water located on opposite walls of the pores.

  4. 4.

    For mesoporous carbon adsorbents, the linearity of the comparative graphs is preserved in a wide range of degrees of filling with subsequent downward deviation of the comparative graphs from the linear dependence. A comparison of the results obtained with the results of numerical modeling of adsorption of water molecules on a carbon surface shows that the break point in the comparative graphs corresponds to confluence of clusters and the formation of a continuous adsorption layer on the surface of the adsorbents.

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Authors and Affiliations

  1. Institute of Physical Chemistry, Academy of Sciences of the USSR, Moscow

    R. Sh. Vartapetyan, A. M. Voloshchuk, M. M. Dubinin & T. A. Moskovskaya

Authors
  1. R. Sh. Vartapetyan
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  2. A. M. Voloshchuk
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  3. M. M. Dubinin
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  4. T. A. Moskovskaya
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Translated from Izvestiya Akademii Nauk SSSR. Seriya Khimicheskaya, No. 9, pp. 1961–1966, September, 1988.

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Vartapetyan, R.S., Voloshchuk, A.M., Dubinin, M.M. et al. Adsorption of water vapors and micropore structures of carbon adsorbents. 16. Comparative method of analysis of the structure of carbon adsorbents. Russ Chem Bull 37, 1751–1755 (1988). https://doi.org/10.1007/BF00962479

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  • DOI: https://doi.org/10.1007/BF00962479

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