CO 2 adsorption over modified AC samples: A new methodology for determining selectivity

Acar, Burcu; Başar, Melek Selcen; Eropak, B. Merve; Çağlayan, Burcu Selen; Aksoylu, A. Erhan

doi:10.1016/j.cattod.2017.10.011

Cited by 13 publications

(10 citation statements)

References 45 publications

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“…While previous results presented for adsorption of CO 2 / CH 4 gas mixtures on modified activated carbons suggest enhanced CH 4 uptakes in the presence of CO 2 , possibly as the result of a modified adsorption mechanism (Acar et al 2018), the results shown here indicate no such enhancement. This difference may well be due to the difference in adsorption conditions (298 K vs. 333 K used here) and the resulting difference in scale of adsorption for the two systems, where the mass of CO 2 sorbed for the modified activated carbons (up to 110 mg/g at 1 bar pure CO 2 ) may alter the uptake of the second gas, while, here, the adsorption capacity does not extend beyond the monolayer.…”

Section: Gas Sweetening: Adsorptive Selectivity Of Co 2 Over Chcontrasting

confidence: 90%

“…This difference may well be due to the difference in adsorption conditions (298 K vs. 333 K used here) and the resulting difference in scale of adsorption for the two systems, where the mass of CO 2 sorbed for the modified activated carbons (up to 110 mg/g at 1 bar pure CO 2 ) may alter the uptake of the second gas, while, here, the adsorption capacity does not extend beyond the monolayer. Despite the large CO 2 uptakes demonstrated for these modified carbons (Acar et al 2018), they exhibited modest CO 2 /CH 4 selectivities, possibly as a result of this binary component enhancement.…”

Section: Gas Sweetening: Adsorptive Selectivity Of Co 2 Over Chmentioning

confidence: 90%

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Adsorption selectivity of CO2 over CH4, N2 and H2 in melamine–resorcinol–formaldehyde xerogels

Principe

Fletcher

2020

Adsorption

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Sorptive selectivity of melamine-resorcinol-formaldehyde xerogels, towards CO 2 , CH 4 , N 2 and H 2 , is reported, where all systems demonstrate potential for selective adsorption of CO 2 from corresponding binary gas mixtures. Selected gas mixtures represent important gas separation applications found in industry, i.e. CO 2 removal from power plant flue gases (CO 2-N 2), sour gas sweetening (CO 2-CH 4), and separation of species in the water-gas shift reaction (CO 2-H 2). All materials tested exhibit microporous character, enhancing adsorption of small molecules, however, it is the inclusion of a nitrogen-rich material into the gel matrix that results in enhanced selectivities for these systems. Despite the porous character of the gels, under the test conditions used to simulate industrial parameters, all three balance gases, i.e. H 2 , N 2 and CH 4 , showed low affinities for the xerogels, while CO 2 adsorption was notably higher and increased with the inclusion and increased concentration of melamine. Ideal adsorbed solution theory was used to demonstrate significant differences in adsorption uptake, especially for CO 2-CH 4 , and high selectivities for CO 2 over N 2. In all cases, selected xerogels exhibited industrially relevant adsorption timescales for CO 2 over competitor gases, demonstrating the potential of these materials for the selective adsorption of CO 2 from process streams.

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Section: Gas Sweetening: Adsorptive Selectivity Of Co 2 Over Chcontrasting

confidence: 90%

Section: Gas Sweetening: Adsorptive Selectivity Of Co 2 Over Chmentioning

confidence: 90%

Adsorption selectivity of CO2 over CH4, N2 and H2 in melamine–resorcinol–formaldehyde xerogels

Principe

Fletcher

2020

Adsorption

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“…Recently, solid adsorption, liquid absorption and membrane separation can be mentioned as the main methods for CO 2 capture [2,6]. Among these methods, CO 2 adsorption is a prominent method due to its advantages such as low energy requirement, low cost, ease of application, and regeneration of the adsorbent [7][8][9][10]. In order for CO 2 adsorption to be efficient, it is important to develop an adsorbent with a high adsorption capacity, selectivity, kinetics and stability [7,11].…”

Section: Introductionmentioning

confidence: 99%

“…Among these methods, CO 2 adsorption is a prominent method due to its advantages such as low energy requirement, low cost, ease of application, and regeneration of the adsorbent [7][8][9][10]. In order for CO 2 adsorption to be efficient, it is important to develop an adsorbent with a high adsorption capacity, selectivity, kinetics and stability [7,11]. Commonly used solid adsorbents for CO 2 capture are zeolites [12][13], silicas [14], clay minerals [15], metal-organic frameworks [16][17][18][19], porous polymer materials [20][21][22] and carbon materials [23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of templated porous carbons from sucrose by one-pot method and application as a CO2 adsorbent

Gürbüz

Tümsek

2021

Turk J Chem

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The templated porous carbons were prepared from sucrose by one-pot method. In this method in which the pre-synthesis of the hard template is eliminated, the porous carbons were produced by organic-inorganic self-assembly of sucrose, tetraethyl ortosilicate (TEOS), Pluronic P123 and n-butanol in an acidic medium and subsequent carbonization. The synthesis parameters such as sucrose amount, TEOS molar ratio and carbonization temperature were evaluated for describing their effects on the pore 2 structures of the synthesized carbons. The prepared porous carbons were characterized by N 2 adsorption, thermogravimetric analysis (TGA), Raman spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) techniques. The carbon dioxide adsorption uptakes of the obtained porous carbons were determined at 1 bar and 273 K. The templated carbon obtained with the lowest TEOS molar ratio exhibited the highest BET surface area of 1289 m 2 /g and micropore volume of 0.467 cm 3 /g, and showed the highest CO 2 uptake of 2.28 mmol/g.

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“…To obtain CO2 adsorbents with high selectivity, high capacity, high hydrothermality, good mechanical properties, chemical stability, low synthesis cost and also fast adsorption/desorption kinetics has long been an attractive field of investigation (Pevida et al, 2008;Díez et al, 2015;Sarkera et al, 2017;Szczęśniak et al, 2017;Acar et al, 2018). The adsorption process using certain adsorbents is one of the most effective methods for separating or capturing CO2, due to its easy operation and low energy requirements (Lee & Park, 2015;Pham et al, 2016).…”

mentioning

confidence: 99%

CO2 Capture using Graphite Waste Composites and Ceria

Kusrini¹,

Utami

Usman

et al. 2018

IJTech

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Solid sorbents based on graphite electrode waste and cerium oxide (ceria, CeO2) have been studied with regard to CO2 capture. The acid-base properties of cerium oxide produce a sorbent for the capture of CO2. The aim of the study is to evaluate the performance of CO2 capture using graphite/CeO2 composites at different weights of Ce(NO3)3.6H2O (0.5, 1 and 2 g), namely G0.5, G1 and G2, respectively. Volumetric adsorption studies of CO2 on graphite/CeO2 composites and ceria were conducted at various pressures (P) of 3, 5, 8, 15 and 20 bar, and temperatures (T) of 303, 308, 318 K. Graphite waste before modification (GBM), activated graphite waste (GA), and CeO2 for capturing CO2 were also investigated. By varying the two parameters (P and T), we found that the maximum adsorption capacities of CO2 at 303 K and 20 bar were 0.0713, 0.0316, 0.1574, 0.0987, 0.1137, and 0.0964 kg/kg respectively, for GBM, GA, G0.5, G1, G2 and CeO2. The highest adsorption capacity of CO2 was found in the G0.5 composite. The adsorption performance of CO2 using ceria was almost similar to the G1 composite. We found that CO2 adsorption capacity decreases with an increasing temperature from 303 to 318 K. It was concluded that ceria and composite graphite waste/CeO2 are stable and selective CO2 sorbents. The work allows us to synthesize a new sorbent which can be effectively applied for CO2 capture. The adsorption capacity of CO2 depends significantly on the active site and chemical modifier of the sorbents.

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CO 2 adsorption over modified AC samples: A new methodology for determining selectivity

Cited by 13 publications

References 45 publications

Adsorption selectivity of CO2 over CH4, N2 and H2 in melamine–resorcinol–formaldehyde xerogels

Adsorption selectivity of CO2 over CH4, N2 and H2 in melamine–resorcinol–formaldehyde xerogels

Preparation and characterization of templated porous carbons from sucrose by one-pot method and application as a CO2 adsorbent

CO2 Capture using Graphite Waste Composites and Ceria

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