Separation of CO 2 /CH 4 using carbon molecular sieve (CMS) at low and high pressure

Rocha, Luís A.; Andreassen, Kari Anne; Grande, Carlos A.

doi:10.1016/j.ces.2017.01.071

Cited by 70 publications

(45 citation statements)

References 27 publications

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“…In order to determine the effects of granulation, the number of moles of carbon dioxide and methane adsorbed by the adsorbent samples at a pressure of 2 bar at 25 °C were investigated and calculated using Eqs. (4) and (5) and Excel software: 18 pV = nRT ( 4 )…”

Section: Resultsmentioning

confidence: 99%

“…might also be used as raw materials. CMSs have not only been used for adsorbing methane, carbon dioxide, 15 carbon monoxide, and nitrogen, 16 but also for separating multiple gas mixtures, such as carbon monoxide-hydrogen-methane, 17 methane-carbon dioxide, 18 and methane-nitrogen. 19 ________________________________________________________________________________________________________________________ Available on line at www.shd.org.rs/JSCS/ (CC) 2020 SCS.…”

Section: Introductionmentioning

confidence: 99%

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Study of carbon dioxide and methane adsorption on carbon molecular sieves, raw and modified by waste engine oil

Zahedi

Ghafourian

Zamani³

et al. 2020

JSCS

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In this study, a carbon molecular sieve (CMS) was synthesized from walnut shells, followed by physical activation of the carbon content of the CMS. Adsorption of CO 2 and CH 4 onto raw and acid treated adsorbents were investigated using two sizes, 300-600 and 600-1180 μm. The adsorbents were impregnated with two solvent mixtures of waste engine oil with kerosene and with thinner at a proportion of 1:1 at 25 °C. The highest adsorption for CO 2 and CH 4 was obtained at the suitable size of a group of CMS (A) adsorbents, with acid treated adsorbents being more efficient than the raw adsorbents. The acid treated CMS (A-3) sample adsorbed 0.925 mol CO 2 g-1 and 0.353 mol CH 4 g-1. The results indicated that by decreasing the granulation size of group CMS (R) adsorbents, the adsorption capacities for CO 2 and CH 4 were reduced while increasing the granulation size of group CMS (A) adsorbents resulted in an enhancement in the adsorption capacity for CO 2 and CH 4. Moreover, acid treated adsorbents achieved enhanced adsorption capacity for CO 2 and CH 4. Further modifications reduced the adsorption capacity for CO 2 and CH 4 in impregnated adsorbents, due to a decrease in surface area, pore volume and pore size of the adsorbent.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of carbon dioxide and methane adsorption on carbon molecular sieves, raw and modified by waste engine oil

Zahedi

Ghafourian

Zamani³

et al. 2020

JSCS

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show abstract

“…In more recent studies [13,[19][20][21][22][23] a variety of PSA and VPSA cycle schedules incorporating recycling steps have been reported. Either equilibrium [13,21,24] or kinetic [23,25] based separations for CO 2 removal from LFG use of multilayered adsorbents for improving the process performances especially in terms of methane productivity [19,26,27]. The use of dual PSA [28,29] presents an innovative solution for obtaining high-purity methane with a high CH 4 recovery from a gas mixture containing CH 4 and CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Nitrogen rejection from landfill gas using Pressure Swing Adsorption

2021

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Landfill gas (LFG) produced from municipal solid waste substrates represents an important source of RNG and the market for its upgrade is facing significant challenges in terms of energy consumption and operating costs. To ensure higher CH 4 yields and avoid its release in the atmosphere, the LFG is collected below the atmospheric pressure by the use of a vacuum pump that results in the contamination of the LFG by air and particularly N 2. Most of the proposed solutions, propose a two-step separation process in which the CO 2 removal takes place in the first one while N 2 removal in the second. This study focuses on the removal of the N 2 from a decarbonated methane stream by a four-step PSA cycle. The impact of several parameters on process performance has been investigated using numerical simulations with the aim of simplifying the unit design and operational performances. In particular we investigate the effect of the pressure at the end of the desorption step showing that it is possible to operate the cycle with the desorption pressure slightly above atmospheric one. This allows avoiding the use of a dedicated vacuum pump with, however, a penalty in the energy required.

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“…In this type of separation technology, the components of a gas mixture are separated by their molecular characteristics and affinity to an adsorbent material. For this purpose, a variety of materials have been studied including zeolites [7][8][9], carbon molecular sieves (CMS) [10][11][12], metal organic frameworks (MOFs) [13][14][15] and activated carbons (ACs) [16][17][18]. Among these materials, activated carbons present advantages in terms of: (i) hydrophobicity; thus, there is no need for a drying step before upgrading; (ii) low heat of adsorption, therefore a low energy of regeneration; (iii) the possibility of heteroatoms' functionalization to modify their adsorption behavior; and (iv) high CO 2 adsorption capacity at ambient pressure [19].…”

Section: Introductionmentioning

confidence: 99%

CO2 and CH4 Adsorption Behavior of Biomass-Based Activated Carbons

et al. 2018

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The aim of the present work is to study the effect of different activation methods for the production of a biomass-based activated carbon on the CO 2 and CH 4 adsorption. The influence of the activation method on the adsorption uptake was studied using three activated carbons obtained by different activation methods (H 3 PO 4 chemical activation and H 2 O and CO 2 physical activation) of olive stones. Methane and carbon dioxide pure gas adsorption experiments were carried out at two working temperatures (303.15 and 323.15 K). The influence of the activation method on the adsorption uptake was studied in terms of both textural properties and surface chemistry. For the three adsorbents, the CO 2 adsorption was more important than that of CH 4 . The chemically-activated carbon presented a higher specific surface area and micropore volume, which led to a higher adsorption capacity of both CO 2 and CH 4 . For methane adsorption, the presence of mesopores facilitated the diffusion of the gas molecules into the micropores. In the case of carbon dioxide adsorption, the presence of more oxygen groups on the water vapor-activated carbon enhanced its adsorption capacity.

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Separation of CO 2 /CH 4 using carbon molecular sieve (CMS) at low and high pressure

Cited by 70 publications

References 27 publications

Study of carbon dioxide and methane adsorption on carbon molecular sieves, raw and modified by waste engine oil

Study of carbon dioxide and methane adsorption on carbon molecular sieves, raw and modified by waste engine oil

Nitrogen rejection from landfill gas using Pressure Swing Adsorption

CO2 and CH4 Adsorption Behavior of Biomass-Based Activated Carbons

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