Adsorption deformation of a microporous AR-V carbon adsorbent during the adsorption of n-hexane

Nabiulin, V. V.; Фомкин, А. А.; Tvardovskiy, Andrey V.

doi:10.1134/s0036024411110227

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…The predictive capabilities of the proposed method are demonstrated based on the experimental data of the adsorption of benzene and n -hexane on the AR-V carbon microporous adsorbent in the range of temperatures from 255 to 353 K. AR-V carbon is produced from coal dust and adhesion agents by steam treatment at 1100 K–1200 K. The experimental adsorption isotherms of benzene and n -hexane at different temperatures in the linear form of the DR equation (log[ V 0 ] as functions of μ 2 /β 2 (see Figure S3)) collapse into one characteristic curve with the pore volume V 0 = 0.26 cm 3 /g and characteristic energy E 0 = 14.3 kJ/mol for benzene obtained from the fitting of experimental adsorption isotherms; the affinity coefficient β =1.29 for n -hexane is taken from ref .…”

Section: Correlation Of Theory and Experimentsmentioning

confidence: 99%

“…Figure presents the universal dimensionless theoretical dependencies of the degree of filling, θ = a / a 0 , for the DR eq and the correspondingly reduced adsorption stress, , eq , as functions of the reduced adsorbate chemical potential, μ/ E , in comparison with the experimental data on benzene and n -hexane on AR-V carbon. calculated with the parameters, E 0 = 14.3 kJ/mol and λ = 0.67, established from the benzene data.…”

Section: Correlation Of Theory and Experimentsmentioning

confidence: 99%

“…Lines correspond to the DR characteristic curve (eq ), and the correspondingly reduced stress (eq ). Experimental data on AR-V carbon for (A) benzene and (B) n -hexane at 353 K (black), 333 K (brown), 313 K (red), 293 K (blue), 273 K (green), and 255 K (purple). The circle symbols correspond to adsorption and square symbols to the desorption data.…”

Section: Correlation Of Theory and Experimentsmentioning

confidence: 99%

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Adsorption-Induced Deformation of Microporous Solids: A New Insight from a Century-Old Theory

Neimark

Grenev

2019

J. Phys. Chem. C

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Potential adsorption theory (PAT) suggested by Polanyi back in 1914 is till date one of the most widely used practical methodologies for the treatment of gas adsorption on microporous materials. Here, we extend PAT to the description of the phenomenon of adsorption-induced deformation, which has been recently attracting widespread interest of various scientific communities, from adsorption separations and energy storage to hydrocarbon recovery and carbon dioxide sequestration to drug delivery and actuators. A universal relationship is established between the stress caused by the interactions of guest molecules with the pore walls and the adsorption isotherm. It is shown that in the course of adsorption, microporous solids exhibit a non-monotonic deformation, with contraction at low gas pressures and expansion as the pressure increases. The proposed theory is verified with the experimental data on benzene and n-hexane adsorption on AR-V microporous carbon over a wide range of temperatures. It allows for predicting the adsorption deformation at different temperatures and with different adsorbates and can be applied to a wide class of microporous solids.

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Section: Correlation Of Theory and Experimentsmentioning

confidence: 99%

Section: Correlation Of Theory and Experimentsmentioning

confidence: 99%

Section: Correlation Of Theory and Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption-Induced Deformation of Microporous Solids: A New Insight from a Century-Old Theory

Neimark

Grenev

2019

J. Phys. Chem. C

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Thermodynamics of methane adsorption on carbon adsorbent prepared from mineral coal

et al. 2021

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Adsorption induced deformation in graphitic slit mesopores: A Monte Carlo simulation study

Diao

Fan

et al. 2017

Chemical Engineering Journal

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A grand canonical Monte Carlo simulation study of argon adsorption in deformable graphitic slit mesopores has been carried out, to determine the mechanisms of deformation in the different stages of adsorption and desorption. At pressures less than the condensation pressure, especially in the submonolayer coverage region, the pore walls are slightly compressed. This is due to the decrease in the potential energy of interaction between the adsorbate and the second graphene layer (the interaction with the outermost graphene layer remains the same) and this enhancement of the solid-fluid interaction compensates for the repulsive penalty incurred by compressing of the graphene layers. This mechanism holds, irrespective of pore size and temperature, because at low loadings the two pore walls behave like two independent surfaces. At higher loadings, after condensation has taken place, adsorbate molecules in the interior of the pore attract the pore walls, while those close to the 2 surface repel them. As a result the pore can either contract or expand at high loadings, depending on the balance between these two mechanisms. Across the capillary condensation, the attraction of the condensate in the pore interior is greater than the repulsion by the adsorbate close to the surface, resulting in pore contraction and a corresponding sharp decrease in the solvation pressure. After the capillary condensation, the pore either expands or contracts, depending on the balance between these two processes, which is a function of pore width and temperature, which in turn determine the commensurate or incommensurate packing and thermal motion of the molecules.

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Adsorption deformation of a microporous AR-V carbon adsorbent during the adsorption of n-hexane

Cited by 6 publications

References 7 publications

Adsorption-Induced Deformation of Microporous Solids: A New Insight from a Century-Old Theory

Adsorption-Induced Deformation of Microporous Solids: A New Insight from a Century-Old Theory

Thermodynamics of methane adsorption on carbon adsorbent prepared from mineral coal

Adsorption induced deformation in graphitic slit mesopores: A Monte Carlo simulation study

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