Calculation of the adsorption-desorption hysteresis curves in narrow-pore systems |
| |
Authors: | Yu K Tovbin A G Petukhov D V Eremich |
| |
Institution: | (1) L. Ya. Karpov Physicochemical Research Institute, 10 ul. Vorontsovo Pole, 105064 Moscow, Russian Federation |
| |
Abstract: | The gas and liquid spinodal branches for an adsorbate located in narrow slit-shaped, cylindrical, and spherocylindrical pores
were calculated. The adsorbate is modeled by Lennard-Jones spherical particles. The calculation was based on the lattice gas
model taking into account the intermolecular interactions of nearest neighbors in the quasichemical approximation. The density-temperature
diagrams for the gas and liquid spinodal branches in the pores are similar to the equilibrium vapor-liquid phase diagrams:
they have a common critical point; the dense-phase branches are shifted to lower pore fillings, while the rarefied-phase branches
are shifted toward higher pore fillings. The width of adsorption-desorption hysteresis loop in the adsorption isotherms for
Lennard-Jones particles was analyzed as a function of the pore size and the interaction potential of the adsorbate with the
pore walls. The effect of pore wall roughness and the accuracy of isotherm calculation on the width of the adsorption-desorption
hysteresis loop in cylindrical pores is discussed
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 813–823, May, 2007. |
| |
Keywords: | adsorption isotherm hysteresis phase diagrams spinodal slit-shaped pores cylindrical pores spherocylindrical pores lattice gas model quasichemical approximation |
本文献已被 SpringerLink 等数据库收录! |
|