Graphenylene and inorganic graphenylene nanopores for gas-phase <sup>4</sup>He/<sup>3</sup>He separation: kinetic and steady-state considerations

Motallebipour, Maryam S.; Karimi-Sabet, Javad

doi:10.1039/d0cp05755j

Cited by 7 publications

(2 citation statements)

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“…Although quantum tunneling is a fundamentally different mechanism from thermally induced barrier climbing, the tunneling rate also depends strongly on the energy barrier height, because the transmission probability depends on the energy barrier E a . [ 81–85 ] For common operation conditions near room temperature, the contribution from quantum tunneling is very low.…”

Section: Theoretical and Simulation Advancesmentioning

confidence: 99%

Gas Separations using Nanoporous Atomically Thin Membranes: Recent Theoretical, Simulation, and Experimental Advances

Yuan

et al. 2022

Advanced Materials

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The separation of gaseous mixtures is essential in the chemical industry, including hydrogen separation in ammonia or petrochemical plants, nitrogen separation from air, CO 2 separation in natural gas processing, [7] olefin/ paraffin separation, [1] and H 2 S separation from sour gas. [8] Similar to separation processes in general, thermal-based gasseparation methods, such as cryogenic distillation, amine adsorption, and vapor condensation, consume a high amount of energy, which can be significantly reduced using gas-separation membrane units. [5,8] A membrane that can separate gases allows certain components in a mixture to permeate at higher rates than others. The economic competitiveness of a gas-separation membrane highly depends on its gas permeance K and its selectivity S. The permeance K i of gas species i (in SI units of mol m −2 s −1 Pa −1 ) is defined as K i = F i /Δp i , where F i (in SI units of mol m −2 s −1 ) is the flux of gas i through the membrane, and Δp i is the partial pressure difference (the driving force) of gas i between the feed side and the permeate side. For relatively thick conventional membranes, whose crossmembrane transport resistance is dominated by the bulk interior, the permeance K i is inversely proportional to the membrane thickness d. Correspondingly, the permeability P i of gas i (in SI units of mol m −1 s −1 Pa −1 ) is defined aswhich is an intrinsic property of a material. The selectivity S ij between gases i and j is defined as S ij = K i /K j = P i /P j .Polymers have been the most widely used materials for gasseparation membranes for decades because of their relatively low cost and low manufacturing difficulty. [8,9] However, membrane separations using state-of-the-art polymeric membranes cannot outcompete the thermal-based separation methods economically. [7] One of the limitations of the polymeric membranes is the trade-off between permeability and selectivity, originally investigated by Robeson. [10,11] The best combination of permeability and selectivity for a binary gas pair is referred to as the polymer upper bound. This trade-off originates from the interplay between the free volume spacing in the polymer matrices and the size of the gas molecules. [12] Smaller polymeric spacing increases the selectivity but sacrifices the permeability due to the lower gas Porous graphene and other atomically thin 2D materials are regarded as highly promising membrane materials for high-performance gas separations due to their atomic thickness, large-scale synthesizability, excellent mechanical strength, and chemical stability. When these atomically thin materials contain a high areal density of gas-sieving nanoscale pores, they can exhibit both high gas permeances and high selectivities, which is beneficial for reducing the cost of gas-separation processes. Here, recent modeling and experimental advances in nanoporous atomically thin membranes for gas separations is discussed. The major challenges involved, including controlling pore size distributions, scaling up the membrane ar...

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Section: Theoretical and Simulation Advancesmentioning

confidence: 99%

Gas Separations using Nanoporous Atomically Thin Membranes: Recent Theoretical, Simulation, and Experimental Advances

Yuan

et al. 2022

Advanced Materials

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“…1 Provided the pore dimensions are appropriately organized, 2D membranes are predicted to differentiate chemical species on the basis of their size, mass, charge, or reactivity. [2][3][4][5][6][7][8][9][10][11][12][13] In particular, gas physisorption on 2D membranes is believed to enable surfacemediated permeation as it would significantly increase the probability of molecules entering the membrane pores. 14 Even though surface diffusion in perforated graphene has attracted immense attention from theoreticians, 15 regular gases held far away from their liquid-vapour equilibria interact weakly with inert solids, and their adsorption is hardly observed in permeation experiments.…”

Section: Introductionmentioning

confidence: 99%

Surface coverage of alcohols on carbon nanomembranes under ambient conditions

Khayya

Dementyev

2022

Phys. Chem. Chem. Phys.

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Graphenylene-Like Structures as a New Class of Multifunctional Materials Alternatives to Graphene

Martins

Fabris

Albuquerque

et al. 2022

Engineering Materials

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Graphenylene and inorganic graphenylene nanopores for gas-phase ⁴He/³He separation: kinetic and steady-state considerations

Abstract: Selective membrane-based separation of light isotopes is considered to be possible based on the quantum phenomena. In this regard, the role of the two mass-dependent effects, quantum tunneling and zero-point...

Cited by 7 publications

References 49 publications

Gas Separations using Nanoporous Atomically Thin Membranes: Recent Theoretical, Simulation, and Experimental Advances

Gas Separations using Nanoporous Atomically Thin Membranes: Recent Theoretical, Simulation, and Experimental Advances

Surface coverage of alcohols on carbon nanomembranes under ambient conditions

Graphenylene-Like Structures as a New Class of Multifunctional Materials Alternatives to Graphene

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Graphenylene and inorganic graphenylene nanopores for gas-phase 4He/3He separation: kinetic and steady-state considerations

Abstract: Selective membrane-based separation of light isotopes is considered to be possible based on the quantum phenomena. In this regard, the role of the two mass-dependent effects, quantum tunneling and zero-point...

Cited by 7 publications

References 49 publications

Gas Separations using Nanoporous Atomically Thin Membranes: Recent Theoretical, Simulation, and Experimental Advances

Gas Separations using Nanoporous Atomically Thin Membranes: Recent Theoretical, Simulation, and Experimental Advances

Surface coverage of alcohols on carbon nanomembranes under ambient conditions

Graphenylene-Like Structures as a New Class of Multifunctional Materials Alternatives to Graphene

Contact Info

Product

Resources

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Graphenylene and inorganic graphenylene nanopores for gas-phase ⁴He/³He separation: kinetic and steady-state considerations