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

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...

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Bibliographic Details
Published in:Colloid journal of the Russian Academy of Sciences 2019-11, Vol.81 (6), p.797-803
Main Authors: Shkolin, A. V., Fomkin, A. A., Men’shchikov, I. E., Pulin, A. L., Yakovlev, V. Yu
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Carbon
Chemistry
Chemistry and Materials Science
Computer simulation
Deformation
Dynamic structural analysis
Molecular dynamics
Polymer Sciences
Surfaces and Interfaces
Thin Films
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Summary: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.
ISSN:1061-933X
1608-3067
DOI:10.1134/S1061933X19060188