Impact of adsorbent carbons and carbon surface conductivity on adsorption capacity of CO2, CH4, N2 and gas separation

Oufir, Zineb El; Ramézani, Hamidréza; Mathieu, Nathalie; Delpeux, Sandrine

doi:10.1016/j.commatsci.2021.110572

Cited by 12 publications

(5 citation statements)

References 94 publications

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“…In the gas-phase adsorption applications of activated carbon, the conduction mechanism involves four aspects: the inherent electrical conductivity of activated carbon [21], the spatial hindrance effect [22], the surface adsorption layer effect [23], and the surface charge effect [24]. Figure 1 shows the mechanism of electrical conductivity change during adsorption on activated carbon.…”

Section: The Reason For Changes In Electrical Conductivity During The...mentioning

confidence: 99%

Dynamic detection of saturated distribution of activated carbon adsorbed volatile organic compounds based on electrical impedance tomography

Pang,

Zhao,

Sun

et al. 2024

Meas. Sci. Technol.

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The electrical impedance tomography (EIT) has been achieved for the dynamic detection of the adsorption saturation distribution in activated carbon. Volatile organic compounds (VOCs) emitted by industries pose a serious threat to human health and environmental quality. Therefore, adsorption method is widely used to treat such organic compounds. Activated carbon, as a commonly used adsorbent material, plays a crucial role in the efficient utilization and management of the adsorption process. Traditional adsorption detection methods suffer from information loss and discontinuity. We can obtain the conductivity distribution information during the current passing through the material by measuring the potential changes on the boundary of interest field, and analyze the saturation distribution information of VOCs adsorbed on activated carbon based on the conductivity distribution image. The feasibility of the technology in monitoring the saturation distribution of the adsorption process in activated carbon was verified by principle and simulation. For experimental verification, fixed bed and fluidized bed experiments were carried out, taking into account the special case of impedance change factors of activated carbon particles in the static and flow states. The experimental results confirm that the adsorption impedance change response is well obtained at an excitation frequency of 4KHz and the saturation distribution imaging can be steady imaged regardless of whether the adsorbent is changed or not. This study introduces a new method for visualizing the monitoring process of activated carbon adsorption.

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Section: The Reason For Changes In Electrical Conductivity During The...mentioning

confidence: 99%

Dynamic detection of saturated distribution of activated carbon adsorbed volatile organic compounds based on electrical impedance tomography

Pang,

Zhao,

Sun

et al. 2024

Meas. Sci. Technol.

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“…Currently, the main technologies have been explored for CO 2 /CH 4 separation, including cryogenic separation [ 13 , 14 ], membrane separation [ 15 , 16 , 17 ], water scrubbing [ 18 , 19 ], organic solvent scrubbing [ 20 , 21 ] and solid adsorbent adsorption separation [ 22 , 23 , 24 ]. The solid adsorbents, such as porous zeolites, carbon molecular sieves, titanium silicate, metal–organic frameworks, activated carbon and silica gel [ 25 , 26 , 27 ], presented many advantages of great separation efficiency and renewable capability and cost-effectiveness [ 28 ]. Generally, zeolites are more suitable for adsorbing acid gas, due to their distinctive microporous structure, excellent ion exchange behaviors and high adsorption ability [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Amphipathic Solvent-Assisted Synthetic Strategy for Random Lamellae of the Clinoptilolites with Flower-like Morphology and Thinner Nanosheet for Adsorption and Separation of CO2 and CH4

Jia

Sun

et al. 2023

Nanomaterials

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The random lamellae of the synthetic CP were synthesized with a hydrothermal approach using o-Phenylenediamine (OPD) as a modifier. The decreases in the order degree of the CP synthesized in the presence of the OPD resulted from the loss of long-range order in a certain direction. Subsequently, the ultrasonic treatment and washing were conducive to further facilitate the disordered arrangements of its lamellae. The possible promotion mechanism regarding the nucleation and growth behaviors of the sol-gel particles was proposed. The fractal evolutions of the aluminosilicate species with crystallization time implied that the aluminosilicate species became gradually smooth to rough during the crystallization procedures since the amorphous structures transformed into flower-like morphologies. Their gas adsorption and separation performances indicated that the adsorption capacity of CO2 at 273 K reached up to 2.14 mmol·g−1 at 1 bar, and the selective factor (CO2/CH4) up to 3.4, much higher than that of the CPs synthesized without additive OPD. The breakthrough experiments displayed a longer breakthrough time and enhancement of CO2 uptake, showing better performance for CO2/CH4 separation. The cycling test further highlighted their efficiency for CO2/CH4 separation.

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“…Porous activated carbons (AC) having large pore volumes and surface areas are widely adopted [2,12,13]. Adsorption of CO 2 on AC near critical point or under supercritical conditions has been extensively studied experimentally [13][14][15] and by modelling [16][17][18]. In comparison with experimental technologies, the molecular simulation method is more timeand cost-efficient [12,16,17].…”

Section: Introductionmentioning

confidence: 99%

“…Adsorption of CO 2 on AC near critical point or under supercritical conditions has been extensively studied experimentally [13][14][15] and by modelling [16][17][18]. In comparison with experimental technologies, the molecular simulation method is more timeand cost-efficient [12,16,17]. Among various molecular simulation methods, Grand Canonical Monte Carlo (GCMC) simulation is capable to mimic the volumetric adsorption that is widely used in practice [12,17,19].…”

Section: Introductionmentioning

confidence: 99%

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Low temperature adsorption of CO2 in carbonaceous wedge pores: a Monte Carlo simulation study

2022

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A systematic study of carbon dioxide in wedge pores under subcritical conditions were conducted with Grand Canonical Monte Carlo simulation. The effects of various factors: temperature, pore geometry (i.e., pore width, length, tilt angle and corrugation), on the formation of stepwise isotherms, were particularly investigated. The occurrence of this step-wise adsorption behaviour is correlated to the alternate packing between the commensurate and incommensurate along the pore axis direction. The steps faded with temperature, due to the adsorbates are less structured and gradually receded mainly from the wide end where the weakest potential exerted to the fluids. The number of steps on desorption branch depends on the number of junctions and domains formed. The particles accumulating at the narrow end in open wedge pore play a role analogy to the closed end. Moreover, having corrugation on the interior solid surface also results different mechanisms illustrated in the stepwise behaviour due to the change in the actual pore size distribution and the interference to the force field inside the pore.

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Impact of adsorbent carbons and carbon surface conductivity on adsorption capacity of CO2, CH4, N2 and gas separation

Cited by 12 publications

References 94 publications

Dynamic detection of saturated distribution of activated carbon adsorbed volatile organic compounds based on electrical impedance tomography

Dynamic detection of saturated distribution of activated carbon adsorbed volatile organic compounds based on electrical impedance tomography

Amphipathic Solvent-Assisted Synthetic Strategy for Random Lamellae of the Clinoptilolites with Flower-like Morphology and Thinner Nanosheet for Adsorption and Separation of CO2 and CH4

Low temperature adsorption of CO2 in carbonaceous wedge pores: a Monte Carlo simulation study

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