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Adsorption-Induced and Thermal Deformation of Microporous Carbon Adsorbent upon n-Octane Adsorption

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Abstract

Relative linear adsorption-induced deformation of granules of AR-V microporous carbon adsorbent has been measured upon n-octane adsorption at pressures p of 1 Pa to 1.6 kPa and temperatures T = 273, 293, 313, 353, and 393 K. At p > 200 Pa, the adsorption-induced deformation is positive and grows with p throughout the considered temperature range. Under isobaric conditions, the adsorption-induced deformation and the slope of deformation isotherms increase as T decreases. At p < 200 Pa and T < 350 K, the adsorption-induced deformation is negative. The range of adsorbent contraction narrows with an increase in T, and, at T > 350 K, the adsorbent expands throughout the pressure range. Molecular dynamics simulation has been employed to study the structure of n-octane adsorption associates in model slit-like micropores having a width corresponding to the effective size of micropores in AR-V adsorbent calculated in terms of the theory of volume filling of micropores. The structure of the adsorption associates has been related to the characteristic features of the adsorption-induced deformation of AR-V adsorbent.

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ACKNOWLEDGMENTS

We are grateful to the Center for Collective Use of the Frumkin Institute of Physical Chemistry and Electrochemistry for allowing us to use experimental equipment.

Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation, subject no. 01 201 353 185.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Moscow, Russia

    A. V. Shkolin, A. A. Fomkin, I. E. Men’shchikov, A. L. Pulin & V. Yu. Yakovlev

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  1. A. V. Shkolin
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  2. A. A. Fomkin
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  3. I. E. Men’shchikov
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  4. A. L. Pulin
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  5. V. Yu. Yakovlev
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Correspondence to A. V. Shkolin.

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The authors declare that they have no conflict of interest.

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Translated by L. Tkachenko

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Shkolin, A.V., Fomkin, A.A., Men’shchikov, I.E. et al. Adsorption-Induced and Thermal Deformation of Microporous Carbon Adsorbent upon n-Octane Adsorption. Colloid J 81, 797–803 (2019). https://doi.org/10.1134/S1061933X19060188

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  • DOI: https://doi.org/10.1134/S1061933X19060188

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