Adsorption deformation in the microporous carbon adsorbent-benzene system and porous structure of adsorbents

Abstract

The relative adsorption deformaiion of several microporous carbon adsorbents was studied as a function of the benzene adsorption at relative pressure ranging from 1 9 10 -I to 1.0 and at 293 K. A correlation between the maximum compression of the sample and the characteristic energy of benzene adsorption of the Dubinin--Radushkevich equation was obtained. Using data on the adsorption deformation, it is possible to identify the region with a specific pore size that cannot be evaluated with the help of the Dubinin--Radushkevich equation.

Adsorption of Gases, Vapors and Liquids by Microporous Adsorbents

“…The highest value of adsorption deformation experienced by NaX zeolite during adsorption of Xe does not exceed 0.06%. Similar relations were reported (Fomkin et al, 2000) for benzene on microporous activated carbons FAS and ACC at 273 • C (Fig. 5).…”

Vapor-phase adsorption of a mixture of benzene and chlorobenzene on the carbon adsorbent obtained by pyrolysis of hypercrosslinked polystyrene

“…one of the reasons seems to be the deformation, i.e., the extension of the adsorbent matrix caused by vapor sorption. 21,22 This assumption is confirmed by measurements of carbon swelling in these solvents. The dilatometric effect is +3% for chloroben zene, while within the experimental error it is not ob served for benzene.…”

Solid deformation induced by the adsorption of methane and methanol under sub- and supercritical conditions

“…This early work was followed by experimental studies of the swelling of charcoal that accompanies the adsorption of water, carbon dioxide and other gases by Bangham and Fakhoury [2] and several investigations of the extension of carbon rods under the influence of a variety of organic vapours by Canadian groups [3][4][5]. More recent experimental work on the deformation of carbons during the adsorption of different gases has been reported by Fomkin and co-workers [6][7][8] and a dilatometric investigation of the deformation of carbon xerogels has been made by Balzer and co-workers [9] who concluded that micropores in the adsorbents made the most significant contribution to the expansion and contraction of these materials. Recognizing the significance of the effect of adsorption-induced deformation, more attention is paid on this phenomenon for various systems beside carbonaceous materials, such as porous glass [10], zeolites [11], silica gels [12], porous silicon [13,14] and metal-organic frameworks (MOFs) [15,16].…”