Adsorption of alkanes, alkenes and their mixtures in single-walled carbon nanotubes and bundles

Jakobtorweihen, Sven; Keil, Frerich J.

doi:10.1080/08927020802378936

Cited by 17 publications

(12 citation statements)

References 45 publications

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“…Accordingly, the optimization of the geometrical properties like the tube diameter and the intertube distance has always been a question. Jakobtorweihen et al 9 employed GCMC simulations to investigate the adsorption of linear alkanes and alkenes on CNTs with different tube diameters. Narrower pores were found to have higher adsorption at low pressure ( p o 2 bar) and lower adsorption at high pressure (2 bar o p o 1000 bar).…”

Section: Introductionmentioning

confidence: 99%

Adsorption and separation of binary and ternary mixtures of SO₂, CO₂ and N₂ by ordered carbon nanotube arrays: grand-canonical Monte Carlo simulations

Rahimi

Singh

Müller‐Plathe

2016

Phys. Chem. Chem. Phys.

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The adsorption and separation behavior of SO2-CO2, SO2-N2 and CO2-N2 binary mixtures in bundles of aligned double-walled carbon nanotubes is investigated using the grand-canonical Monte Carlo (GCMC) method and ideal adsorbed solution theory. Simulations were performed at 303 K with nanotubes of 3 nm inner diameter and various intertube distances. The results showed that the packing with an intertube distance d = 0 has the highest selectivity for SO2-N2 and CO2-N2 binary mixtures. For the SO2-CO2 case, the optimum intertube distance for having the maximum selectivity depends on the applied pressure, so that at p < 0.8 bar d = 0 shows the highest selectivity and at 0.8 bar < p < 2.5 bar, the highest selectivity belongs to d = 0.5 nm. Ideal adsorbed solution theory cannot predict the adsorption of the binary systems containing SO2, especially when d = 0. As the intertube distance is increased, the ideal adsorbed solution theory based predictions become closer to those of GCMC simulations. Only in the case of CO2-N2, ideal adsorbed solution theory is everywhere in good agreement with simulations. In a ternary mixture of all three gases, the behavior of SO2 and CO2 remains similar to that in a SO2-CO2 binary mixture because of the weak interaction between N2 molecules and CNTs.

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Section: Introductionmentioning

confidence: 99%

Adsorption and separation of binary and ternary mixtures of SO₂, CO₂ and N₂ by ordered carbon nanotube arrays: grand-canonical Monte Carlo simulations

Rahimi

Singh

Müller‐Plathe

2016

Phys. Chem. Chem. Phys.

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“…This theoretical ideal adsorption expression has been adopted previously to evaluate the selectivity of binary mixture gas adsorption at relatively low pressures in various porous media123031323334. The selectivity for the adsorption of SF 6 over N 2 in the interstitial and internal nanopores of the CNHs (shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Wide Carbon Nanopores as Efficient Sites for the Separation of SF6 from N2

Takase

Kanoh

Ohba

2015

Sci Rep

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SF6 and SF6-N2 mixed gases are used widely as insulators, but such gases have high greenhouse gas potential. The separation of SF6 from SF6-N2 mixed gases is an inevitable result of their use. Single-walled carbon nanohorns (CNHs) were used here for a fundamental study of the separation of SF6 and N2. The diameters of the interstitial and internal nanopores of the CNHs were 0.7 and 2.9 nm, respectively. The high selectivity of SF6 over N2 was observed only in the low-pressure regime in the interstitial 0.7 nm nanopores; the selectively was significantly decreased at higher pressures. In contrast, the high selectivity was maintained over the entire pressure range in the internal 2.9-nm nanopores. These results showed that the wide carbon nanopores were efficient for the separation of SF6 from the mixed gas.

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“…These materials show stronger interaction with olefin, and the loading is based on the effect described by Dewar, Chatt, and Duncanson [ 9 , 10 ]. A selectivity analogous to ZIF-4 has in principle been reported for similar adsorbents namely ZIF-7 [ 11 ], ZIF-8 [ 7 ], ZIF-71 [ 2 ] FIR-51 [ 12 ], UTSA-10 [ 13 ], and PCN-250 [ 14 ] and several activated carbons [ 15 , 16 , 17 ]. However, these materials are more expensive in preparation, exhibit an unfavorable separation potential, or are not well studied.…”

Section: Introductionmentioning

confidence: 84%

Continuous Separation of Light Olefin/Paraffin Mixtures on ZIF-4 by Pressure Swing Adsorption and Membrane Permeation

et al. 2018

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In this study, two zeolitic imidazolate frameworks (ZIFs) called ZIF-4 and ZIF-zni (zni is the network topology) were characterized by sorption studies regarding their paraffin/olefin separation potential. In particular, equilibrated pure and mixed gas adsorption isotherms of ethane and ethene were recorded at 293 K up to 3 MPa. ZIF-4 exhibits selectivities for ethane in the range of 1.5–3, which is promising for continuous pressure swing adsorption (PSA). ZIF-4 shows high cycle stability with promising separation potential regarding ethane, which results in purification of the more industrial desired olefin. Furthermore, both ZIF materials were implemented in Matrimid to prepare a mixed matrix membrane (MMM) and were used in the continuous separation of a propane/propene mixture. The separation performance of the neat polymer is drastically increased after embedding porous ZIF-4 crystals in the Matrimid matrix, especially at higher feed pressures (3–5 barg). Due to the smaller kinetic diameter of the olefin, the permeability is higher compared to the paraffin.

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Adsorption of alkanes, alkenes and their mixtures in single-walled carbon nanotubes and bundles

Cited by 17 publications

References 45 publications

Adsorption and separation of binary and ternary mixtures of SO₂, CO₂ and N₂ by ordered carbon nanotube arrays: grand-canonical Monte Carlo simulations

Adsorption and separation of binary and ternary mixtures of SO₂, CO₂ and N₂ by ordered carbon nanotube arrays: grand-canonical Monte Carlo simulations

Wide Carbon Nanopores as Efficient Sites for the Separation of SF6 from N2

Continuous Separation of Light Olefin/Paraffin Mixtures on ZIF-4 by Pressure Swing Adsorption and Membrane Permeation

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Adsorption of alkanes, alkenes and their mixtures in single-walled carbon nanotubes and bundles

Cited by 17 publications

References 45 publications

Adsorption and separation of binary and ternary mixtures of SO2, CO2 and N2 by ordered carbon nanotube arrays: grand-canonical Monte Carlo simulations

Adsorption and separation of binary and ternary mixtures of SO2, CO2 and N2 by ordered carbon nanotube arrays: grand-canonical Monte Carlo simulations

Wide Carbon Nanopores as Efficient Sites for the Separation of SF6 from N2

Continuous Separation of Light Olefin/Paraffin Mixtures on ZIF-4 by Pressure Swing Adsorption and Membrane Permeation

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Adsorption and separation of binary and ternary mixtures of SO₂, CO₂ and N₂ by ordered carbon nanotube arrays: grand-canonical Monte Carlo simulations

Adsorption and separation of binary and ternary mixtures of SO₂, CO₂ and N₂ by ordered carbon nanotube arrays: grand-canonical Monte Carlo simulations