Comparative study of the CH4/CO2 adsorption selectivity of activated carbons for biogas upgrading

Peredo-Mancilla, Deneb; Ghimbeu, Camélia Matei; Ho, Bich-Ngoc; Jeguirim, Mejdi; Hort, Cécile; Bessières, David

doi:10.1016/j.jece.2019.103368

Cited by 46 publications

(20 citation statements)

References 66 publications

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“…Attending to the adsorption capacity, some of the activated carbons with task-specific functionalization presented a higher CO 2 capacity (5.9 mol/kg at 303 K and 23 bar) but working at a high pressure and losing power selectivity to CO 2 (CO 2 selectivity of 4.7). 49 On the other hand, current results with ENIL sorbents improve those recently obtained with supported IL sorbents, 9,34,42 which may be related to the higher amount of IL incorporated into the ENIL material.…”

Section: ■ Results and Discussionsupporting

confidence: 70%

“…Compared with the behavior of zeolites and activated carbon , in the adsorption of CO 2 /CH 4 mixtures, it can be clearly confirmed that ENIL materials showed a much higher selectivity to CO 2 than a wide range of supports. Attending to the adsorption capacity, some of the activated carbons with task-specific functionalization presented a higher CO 2 capacity (5.9 mol/kg at 303 K and 23 bar) but working at a high pressure and losing power selectivity to CO 2 (CO 2 selectivity of 4.7) . On the other hand, current results with ENIL sorbents improve those recently obtained with supported IL sorbents, ,, which may be related to the higher amount of IL incorporated into the ENIL material.…”

Section: Resultssupporting

confidence: 53%

“…Therefore, the gas capture obtained for the six ENIL materials tested was mainly due to the chemical absorption of CO 2 by the IL, showing a remarkably high CO 2 /CH 4 selectivity (>1000 for all ENIL studied, as can be seen in Table ). Compared with the behavior of zeolites and activated carbon , in the adsorption of CO 2 /CH 4 mixtures, it can be clearly confirmed that ENIL materials showed a much higher selectivity to CO 2 than a wide range of supports. Attending to the adsorption capacity, some of the activated carbons with task-specific functionalization presented a higher CO 2 capacity (5.9 mol/kg at 303 K and 23 bar) but working at a high pressure and losing power selectivity to CO 2 (CO 2 selectivity of 4.7) .…”

Section: Resultsmentioning

confidence: 84%

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Selective CO₂/CH₄ Separation by Fixed-Bed Technology Using Encapsulated Ionic Liquids

Lemus

Paramio

Hospital-Benito

et al. 2022

ACS Sustainable Chem. Eng.

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The performance of encapsulated ionic liquid (ENIL) sorbents has been experimentally evaluated in CO 2 /CH 4 separation by means of gravimetric and fixed-bed measurements. Six ionic liquids (ILs) with CO 2 chemical absorption ([Emim][Acetate], [Bmim][Acetate], [P 66614 ][CNPyr], [Bmim][GLY], [Bmim][MET], and [Bmim]-[PRO]) were selected for the selective separation of CO 2 from CH 4 . ENIL materials were prepared by encapsulation of these ILs in synthesized carbon submicrocapsules, achieving a ∼70% in mass of IL. Fixed-bed experiments of CO 2 capture were carried out to evaluate the CO 2 /CH 4 separation performance of prepared ENIL materials at different CO 2 partial pressures and 303 K. Both thermodynamics and kinetics of CO 2 sorption were analyzed. The experimental CO 2 and CH 4 isotherms in ENIL materials obtained from fixed-bed experiments were successfully compared to those obtained by reliable gravimetric tests and fitted to the Langmuir− Freundlich equilibrium model. In addition, experimental CO 2 breakthrough curves were well-described by the linear driving force and Yoon and Nelson kinetic models, providing sorption rate constants. ENIL sorbents show high CO 2 uptake capacity, comparable to conventional adsorbents, but with drastically higher selectivity, in concordance with the negligible CH 4 solubility in ILs at the used operating conditions, with acetate-based ENIL materials being the best sorbents in thermodynamic terms. The obtained kinetic parameters revealed that the CO 2 chemical sorption with ENIL materials overcomes the IL mass transfer limitations. The sorption rates are faster than those obtained with ENIL using IL physical absorbents and seem to be controlled by the reaction kinetics. The [P 66614 ][CNPyrr]-based ENIL is found to be the most promising material, combining favorable kinetic and thermodynamic considerations for future development of CO 2 /CH 4 separation using fixed-bed technology.

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Section: ■ Results and Discussionsupporting

confidence: 70%

Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 84%

See 1 more Smart Citation

Selective CO₂/CH₄ Separation by Fixed-Bed Technology Using Encapsulated Ionic Liquids

Lemus

Paramio

Hospital-Benito

et al. 2022

ACS Sustainable Chem. Eng.

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“…S7) revealed, in a typical biogas composition (40 % CO 2 and 60 % CH 4 ), a selectivity of 7.8 (purity 84 %) for the treated sample over 6.3 (purity 81 %) for the untreated sample which is considered very good for an activated carbon. [60][61][62] In typical flue gas composition (20 % CO 2 and 80 % N 2 ), a selectivity of 31 (purity 89 %) for the treated sample over 26 (purity 86 %) for the untreated sample was obtained. See supplementary information for further details.…”

Section: Co 2 Adsorption and Selectivitymentioning

confidence: 99%

A Study of Plasma−Porous Carbon−Co2 Interactions: Ammonia Plasma Treatment and Co2 Capture

Buddhadasa

Verougstraete²,

Gomez-Rueda³

et al. 2022

SSRN Journal

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“…In this paper we focus on adsorption technologies, especially materials (in this case, alternative ones), for which proper selection is a key factor in the successful use of this technology in biogas upgrading and cleaning [22]. Typical adsorbents used for the adsorptive separation of methane from carbon dioxide are usually carbon materials [23], such as activated carbons [24,25], carbon molecular sieves [26], and the increasingly popular MOFs [27,28], as well as their modified forms [29]. As waste materials, chars obtained from the pyrolysis of rubber tires have great potential [30], the same as adsorbents produced from biomass [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Alternative Materials for the Enrichment of Biogas with Methane

et al. 2021

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Carbonaceous adsorbents have been pointed out as promising adsorbents for the recovery of methane from its mixture with carbon dioxide, including biogas. This is because of the fact that CO2 is more strongly adsorbed and also diffuses faster compared to methane in these materials. Therefore, the present study aimed to test alternative carbonaceous materials for the gas separation process with the purpose of enriching biogas in biomethane and to compare them with the commercial one. Among them was coconut shell activated carbon (AC) as the adsorbent derived from bio-waste, rubber tire pyrolysis char (RPC) as a by-product of waste utilization technology, and carbon molecular sieve (CMS) as the commercial material. The breakthrough experiments were conducted using two mixtures, a methane-rich mixture (consisting of 75% CH4 and 25% CO2) and a carbon dioxide-rich mixture (containing 25% CH4 and 75% CO2). This investigation showed that the AC sample would be a better candidate material for the CH4/CO2 separation using a fixed-bed adsorption column than the commercial CMS sample. It is worth mentioning that due to its poorly developed micropore structure, the RPC sample exhibited limited adsorption capacity for both compounds, particularly for CO2. However, it was observed that for the methane-rich mixture, it was possible to obtain an instantaneous concentration of around 93% CH4. This indicates that there is still much potential for the use of the RPC, but this raw material needs further treatment. The Yoon–Nelson model was used to predict breakthrough curves for the experimental data. The results show that the data for the AC were best fitted with this model.

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Comparative study of the CH4/CO2 adsorption selectivity of activated carbons for biogas upgrading

Cited by 46 publications

References 66 publications

Selective CO₂/CH₄ Separation by Fixed-Bed Technology Using Encapsulated Ionic Liquids

Selective CO₂/CH₄ Separation by Fixed-Bed Technology Using Encapsulated Ionic Liquids

A Study of Plasma−Porous Carbon−Co2 Interactions: Ammonia Plasma Treatment and Co2 Capture

Alternative Materials for the Enrichment of Biogas with Methane

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Comparative study of the CH4/CO2 adsorption selectivity of activated carbons for biogas upgrading

Cited by 46 publications

References 66 publications

Selective CO2/CH4 Separation by Fixed-Bed Technology Using Encapsulated Ionic Liquids

Selective CO2/CH4 Separation by Fixed-Bed Technology Using Encapsulated Ionic Liquids

A Study of Plasma−Porous Carbon−Co2 Interactions: Ammonia Plasma Treatment and Co2 Capture

Alternative Materials for the Enrichment of Biogas with Methane

Contact Info

Product

Resources

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Selective CO₂/CH₄ Separation by Fixed-Bed Technology Using Encapsulated Ionic Liquids

Selective CO₂/CH₄ Separation by Fixed-Bed Technology Using Encapsulated Ionic Liquids