Adsorption equilibrium and transport kinetics for a range of probe gases in Takeda 3A carbon molecular sieve

Rutherford, Shannon; Coons, J. E.

doi:10.1016/j.jcis.2004.10.037

Cited by 24 publications

(32 citation statements)

References 23 publications

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“…(10) (Do, 1998) for a slab geometry where Л is half of the slab thickness (measured with a caliper) and D is the diffusivity coefficient. On the other hand, when the gas diffusion is controlled by the pore mouth barrier, a LDF (linear driving force) model is used instead (Rutherford and Coons, 2005), represented by Eq. (11) (Glueckauf, 1955), where k represents a mass transfer coefficient.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Boehmite-phenolic resin carbon molecular sieve membranes—Permeation and adsorption studies

Teixeira

Rodrigues

Campo

et al. 2014

Chemical Engineering Research and Design

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Composite carbon molecular sieve membranes (c-CMSM) were prepared in a single dipping-drying-carbonization step from phenolic resin solutions (12.5-15 wt.%) loaded with boehmite nanoparticles (0.5-1.2 wt.%). A carbon matrix with well-dispersed Al2O3 nanowires was formed from the decomposition of the resin and dehydroxylation of boehmite. The effect of the carbon/Al2O3 ratio on the porous structure of the c-CMSM was accessed based on the pore size distribution and gas permeation toward N2, O2, CO2, He, H2, C3H6 and C3H8. c-CMSM with higher carbon/Al2O3 ratios had a more open porous structure, exhibiting higher permeabilities and lower permselectivities. c-CMSM performance was above the upper bound curves for polymeric membranes for several gas pairs, particularly for C3H6/C3H8 (permeability toward C3H6 of 420 barrer and permselectivity of 18.1 for a c-CMSM with carbon/Al2O3 ratio of 4.4).Unsupported films were also prepared (carbon/Al2O3 ratio 7.3) and crushed into small flakes. Equilibrium isotherms of H2, N2, O2, CO2, C3H8 and C3H6 at 293 K were determined on these flakes to obtain the kinetic and adsorption selectivities toward gas pairs of interest; obtained adsorption and diffusion coefficients accurately predicted the permeabilities of all studied gases except CO2 (experimental and predicted permeabilities of 1148 and 154 barrer, respectively).

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Section: Adsorption Isothermsmentioning

confidence: 99%

Boehmite-phenolic resin carbon molecular sieve membranes—Permeation and adsorption studies

Teixeira

Rodrigues

Campo

et al. 2014

Chemical Engineering Research and Design

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“…range from 17 to 21 kJ/mol for nitrogen and 16.5 to 20 kJ/mol for oxygen. 27 In the case of constant NVT carbon models, the isosteric heats obtained from simulations (see Figure 8b) are somewhat higher than experimental isosteric heats of adsorption. On the other hand, isosteric heats of adsorption in carbon models generated from constant NpT MC method are generally within the range of experimental values (mentioned above).…”

Section: Nitrogen and Oxygen Adsorption In Npc Modelsmentioning

confidence: 77%

“…The amounts of nitrogen and oxygen adsorbed are seen to be significantly lower than those for the constant NpT models. The experimental data in (a) is from Ma et al 25 and that in (b) is from Rutherford et al 27 The constant NpT MC isotherms are obtained by averaging over models from Simulations 1 through 3 (see Table 2). The average isotherm for corresponding constant NVT models has also been shown.…”

Section: Nitrogen and Oxygen Adsorption In Npc Modelsmentioning

confidence: 99%

Grand canonical Monte Carlo simulation of adsorption of nitrogen and oxygen in realistic nanoporous carbon models

2011

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in Wiley Online Library (wileyonlinelibrary.com).Adsorption of nitrogen and oxygen in nanoporous carbons (NPC) is simulated using grand canonical Monte Carlo simulations, where the Steele potential (developed for gas interactions with graphite) is used to represent gas-carbon interactions. NPC models used for the adsorption simulations are developed using an isothermal-isobaric (constant NpT) ensemble Monte Carlo algorithm whereby an initial polymer chain is evolved through a series of atomic displacement and bond rearrangement steps into the final carbon structure. These constant NpT carbon models are representative of real NPCs in terms of local structure and chemical composition. Predictions of nitrogen and oxygen sorption from our model NPCs show good agreement with experimental data. The isosteric heats of adsorption of both adsorbates lie within the range of experimental values for NPCs. Furthermore, the adsorption isotherms of the two gases showsemi-quantitative match with experimental adsorption isotherms.

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“…Metal-organic frameworks (MOFs) typically have the preferential adsorption sequence O2>Ar>N2 35,36 , zeolites have N2>O2>Ar 37,38 and carbon-based materials display the two situations with similar frequency 39, 40 . We were able to find a single case of an adsorbent having an O2>N2>Ar sequence of preferential adsorption 41 . To date, to the best of our knowledge, only six known Ag-free porous materials show Ar/O2 equilibrium selectivity; MIL-53(Al) (the "breathing" MOF) 42 , mordenite (zeolite) 30,43 , a CMS 44 , ZSM-5 (zeolite) 30,45 , a polymer of intrinsic microporosity 46 and an activated carbon 47 , having equilibrium Ar/O2 selectivities of, respectively, 1.26, 1.12, 1.11, 1.08, 1.09 and 1.06.…”

Section: Introductionmentioning

confidence: 95%

Hydrophobic dipeptide crystals: a promising Ag-free class of ultramicroporous materials showing argon/oxygen adsorption selectivity

Afonso

Mendes

Gales

2014

Phys. Chem. Chem. Phys.

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The adsorption isotherms of nitrogen, oxygen and argon in four VA-class hydrophobic dipeptides are presented. Isotherms were determined at 5, 20 and 35 ºC, for a pressure range of 0-6 bar. Under these conditions, adsorption is still in the Henry region. For all materials and temperatures, the sequence of preferential adsorption is Ar>O2>N2, a highly abnormal result. At 5 ºC, the dipeptide with the smallest pores, VI, has Ar/O2 adsorption equilibrium selectivities up to 1.30, the highest ever measured in Ag -free adsorbents. Gas uptakes, at 1 bar and 20 ºC, are ~0.05 mol·kg -1 , very low relative values that are partially explained by the low porosity of the solids (< 10 %). The significance of these results for the development of new materials for the process of O2 generation by pressure swing adsorption (PSA) is discussed. The results indicate some of the structural and chemical properties that prospective Ag-free adsorbents should have in order to have Ar/O2 selectivity; hydrophobic pores, less than 0.5 nm-wide, and porosity of, at least, 20 %.

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Adsorption equilibrium and transport kinetics for a range of probe gases in Takeda 3A carbon molecular sieve

Cited by 24 publications

References 23 publications

Boehmite-phenolic resin carbon molecular sieve membranes—Permeation and adsorption studies

Boehmite-phenolic resin carbon molecular sieve membranes—Permeation and adsorption studies

Grand canonical Monte Carlo simulation of adsorption of nitrogen and oxygen in realistic nanoporous carbon models

Hydrophobic dipeptide crystals: a promising Ag-free class of ultramicroporous materials showing argon/oxygen adsorption selectivity

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