Adsorption-Induced Deformation of Adsorbents |
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Authors: | A. A. Fomkin A. V. Shkolin A. L. Pulin I. E. Men’shchikov E. V. Khozina |
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Affiliation: | 1.Frumkin Institute of Physical Chemistry and Electrochemistry,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | Adsorption-induced deformation of AR-V and AUK carbon adsorbents and NaX zeolite has been studied upon adsorption of n-С5Н12, n-С6Н18, n-С7Н16, and CO2 at temperatures of 193?423 K. It has been shown that adsorption-induced deformation is positive upon the physical adsorption of gases and vapors on the surface of a nonporous (macroporous) solid when the excess adsorption is positive. When calculating the adsorption-induced deformation in the region of the capillary-condensation filling of mesopores, the additional pressure in capillaries, which is negative (contraction of an adsorbent), must be taken into account in the case of wetting a solid surface with a liquid adsorbate. The compressibility of AUK microporous carbon adsorbent as a porous solid is almost independent of the temperature and the properties of an adsorbate, and, for adsorption of n-C5H10 and n-C7H16 hydrocarbons and CO2, it is γа = (5.6 ± 0.6) × 10?6 bar?1. The compressibility of AUK adsorbent appears to be 87% higher than that of nonporous graphite. |
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