Deformation of AUK microporous carbon adsorbent induced by krypton adsorption

Abstract

The pressure dependences of the relative linear deformation of AUK microporous carbon adsorbent have been measured upon krypton adsorption in the pressure range of 1 Pa to 6 MPa at 178, 216, 243, 273, 313, 353, and 393 K. For all considered temperatures, the adsorption-induced deformation increases with pressure and decreases with a rise in temperature, except for the initial pressure range p < 0.05 MPa. At low temperatures, the deformation curves show that the adsorbent shrinks in the initial pressure range, the shrinkage region narrowing with an increase in temperature. At relatively high temperatures (T > 350 K), the initial shrinkage is absent and the adsorbent expands with a rise in krypton pressure in the entire pressure range. The description of the deformation versus adsorption value dependences by the equation based on the generalized 6-n intermolecular interaction potential has demonstrated good agreement between the calculated and experimental data, especially in the range of moderate and high fillings of micropores.