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Thermodynamics of krypton adsorption on microporous carbon adsorbent at high pressures

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Abstract

The behavior of the thermodynamic functions for the adsorption system krypton—microporous carbon sorbent ACC is described. The dependences of the differential molar isosteric heat of adsorption, entropy, enthalpy, heat capacity, and differential molar energy of the adsorption system on the adsorption equilibrium parameters were studied over the temperature range from 178 to 393 K and at pressures ranging from 1 to 6•106 Pa. Consideration of the non-ideality of gas phase and non-inertness of the adsorbent leads to a temperature dependence of the thermodynamic functions of the studied adsorption system, especially in the range of high pressures of the adsorptive. The non-ideality of the gas phase and the energetics of the adsorbent—adsorbate system exert the most significant effect on the thermodynamic functions. The non-inertness of the adsorbent in the investigated range of parameters of the adsorption system has a weak effect on the thermodynamic functions of adsorption. In the region of high filling of ACC micropores, the entropy increases, indicating the existence of processes, which change the structure of the adsorbate in the micropores, in particular, to form associates.

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Authors and Affiliations

  1. A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31 Leninsky prosp., 119071, Moscow, Russian Federation

    A. V. Shkolin & A. A. Fomkin

  2. LTD AKELA-N, 20 Pervyi Michurinskii tupik, 141420, Khimki, Moscow Region, Russian Federation

    A. V. Shkolin & S. V. Potapov

Authors
  1. A. V. Shkolin
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  2. A. A. Fomkin
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  3. S. V. Potapov
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Correspondence to A. V. Shkolin.

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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 0607—0613, April, 2017.

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Shkolin, A.V., Fomkin, A.A. & Potapov, S.V. Thermodynamics of krypton adsorption on microporous carbon adsorbent at high pressures. Russ Chem Bull 66, 607–613 (2017). https://doi.org/10.1007/s11172-017-1780-1

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  • DOI: https://doi.org/10.1007/s11172-017-1780-1

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