Comparative Study of Textural Characteristics on Methane Adsorption for Carbon Spheres Produced by CO<sub>2</sub>Activation

Yang, Wen; Feng, Yujie; Chu, Wei

doi:10.1155/2014/916913

Cited by 6 publications

(5 citation statements)

References 45 publications

(62 reference statements)

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“…Our reported CH 4 storage values were superior as 7 folds as of the storage capacities of ACs, reported by Kumar et al [108]. They were in consistence with the reported values of different ACs [29,92,94,[109][110][111]. In addition, they showed better storage capacities values than the 8.9 wt% storage capacity value, reported for MOFs [112].…”

Section: Methane Uptakesupporting

confidence: 87%

Impact of ammonia treatment and platinum group or nickel metal decoration on the activated carbon storage of carbon dioxide and methane

Aboud

ALOthman

Bagabas

2022

Mater. Res. Express

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Greenhouse gases, chiefly carbon dioxide (CO2) and methane (CH4), emission is responsible for the global warming and heat waves which strike the world causing floods and droughts everywhere with more CO2 attributions. The adsorption and desorption capacities of CO2 and CH4 at room temperature and up to 5.0 and 100 bar, respectively, were investigated for the untreated and ammonia-treated activated carbons (ACs), metal-anchored (metal: Ru, Rh, Pd, Ir or Ni) samples. We merged ammonia treatment and metal decoration to discover their influences on the CO2 and CH4 storage capability of ACs and the potential use of such modified ACs for capturing greenhouse gases and purifying natural gas from CO2. The CO2 storage capacities ranged between 25.2 and 27.7 wt.% at 5.0 bar with complete regeneration upon desorption, while the uptakes for CH4 were in the range of 9.6-12.6 wt.% at 35 bar with hysteresis behavior of the adsorbed gas. The highest adsorption capacities were achieved for the pristine samples, showing that metal decoration reduced slightly the adsorption. Ammonia-treated samples showed minor enhancing effect on the CH4 adsorption in comparison to the CO2 adsorption. The higher adsorption capacities of CO2 than those of CH4 could be employed for upgrading the natural gas, while the 9.6 wt.% (2.2 mmol g−1) CO2 storage capacity would allow for its removal from the flue gases at ambient temperature and pressure. The higher adsorption capacity and preferentiality of CO2 over CH4 could be attributed mainly to its higher quadrupole moment and its higher clustering above the AC surfaces, while a minor effect, if any, would be attributed to the modifications of the ACs, implying that physisorption mechanism acted significantly in the adsorption process in comparison to chemisorption mechanism at the studied conditions.

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Section: Methane Uptakesupporting

confidence: 87%

Impact of ammonia treatment and platinum group or nickel metal decoration on the activated carbon storage of carbon dioxide and methane

Aboud

ALOthman

Bagabas

2022

Mater. Res. Express

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“…Monodisperse CSs were synthesized using a modified method previously reported . Firstly, 6 mL of the ammonia aqueous solution (NH 4 OH, 25 wt%) was mixed with a solution containing 480 mL of absolute ethanol and 1200 mL of deionized water and then stirred for more than 1 h. Subsequently, 12 g of resorcinol was added and continually stirred until complete dissolution.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, carbon spheres (CSs) have attracted extensive attention for potential usage as adsorbents [10,11], SCs [3,[12][13][14], lithium-ion battery electrode materials [15,16], and supports for catalysts. Moreover, synthesis of CSs has made tremendous progress and established the foundation for its practical application [9,12,13,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of microporous and mesoporous carbon spheres for high-performance supercapacitor electrode materials

Yang

Feng

Xiao

et al. 2015

Int. J. Energy Res.

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Summary Microporous and mesoporous carbon spheres (CSs) were fabricated using resorcinol and formaldehyde as precursors in the presence of Pluronic F127 as porogen and KOH as the active agent. The textural characteristic and morphology were characterized by scanning electron microscopy, transmission electron microscopy, and N2 adsorption/desorption techniques. Pluronic F127 played an important role for generating mesopores, while KOH activation brought abundant micropores and resulted in a combined microporous and mesoporous structure of the CSs. The results showed that a typical sample (denoted as CS‐F‐K) possessed a spherical shape, with a high specific surface area of 735.4 m2/g, large pore volume of 0.622 cm3/g, and combined microporous and mesoporous structure, which endowed CS‐F‐K good electrochemical performance with a specific capacitance of 182 F/g under a current density of 0.5 A/g, remarkable rate performance, and long‐term cycling stability. After 1000 cycles at 3 A/g, CS‐F‐K electrode can still remain the specific capacitance of 154.8 F/g with a retention of 98.9%. The excellent electrochemical performance of CS‐F‐K was mainly attributed to the micro‐mesoporous structure, which promoted the ion accumulation on the electrode surface and facilitated fast ion transportation. Copyright © 2015 John Wiley & Sons, Ltd.

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“…There are several methods used to produce carbon spheres, including arc discharge [ 12 ], laser ablation [ 13 ], chemical vapor deposition (CVD) (decomposition of chemical substances containing carbon), and pyrolysis and catalytic decomposition of organic compounds by heat treatment of polymers or other materials, often in an autoclave [ 14 , 15 , 16 ]. In the latter approach, reactants are placed in various types of metal autoclaves and usually heated to a (rather low) desired temperature.…”

Section: Introductionmentioning

confidence: 99%

Pressureless and Low-Pressure Synthesis of Microporous Carbon Spheres Applied to CO2 Adsorption

et al. 2020

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In this work, low-pressure synthesis of carbon spheres from resorcinol and formaldehyde using an autoclave is presented. The influence of reaction time and process temperature as well as the effect of potassium oxalate, an activator, on the morphology and CO2 adsorption properties was studied. The properties of materials produced at pressureless (atmospheric) conditions were compared with those synthesized under higher pressures. The results of this work show that enhanced pressure treatment is not necessary to produce high-quality carbon spheres, and the morphology and porosity of the spheres produced without an activation step at pressureless conditions are not significantly different from those obtained at higher pressures. In addition, CO2 uptake was not affected by elevated pressure synthesis. It was also demonstrated that addition of the activator (potassium oxalate) had much more effect on key properties than the applied pressure treatment. The use of potassium oxalate as an activator caused non-uniform size distribution of spherical particles. Simultaneously higher values of surface area and total pore volumes were reached. A pressure treatment of the carbon materials in the autoclave significantly enhanced the CO2 uptake at 25 °C, but had no effect on it at 0 °C.

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Comparative Study of Textural Characteristics on Methane Adsorption for Carbon Spheres Produced by CO₂Activation

Cited by 6 publications

References 45 publications

Impact of ammonia treatment and platinum group or nickel metal decoration on the activated carbon storage of carbon dioxide and methane

Impact of ammonia treatment and platinum group or nickel metal decoration on the activated carbon storage of carbon dioxide and methane

Fabrication of microporous and mesoporous carbon spheres for high-performance supercapacitor electrode materials

Pressureless and Low-Pressure Synthesis of Microporous Carbon Spheres Applied to CO2 Adsorption

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Comparative Study of Textural Characteristics on Methane Adsorption for Carbon Spheres Produced by CO2Activation

Cited by 6 publications

References 45 publications

Impact of ammonia treatment and platinum group or nickel metal decoration on the activated carbon storage of carbon dioxide and methane

Impact of ammonia treatment and platinum group or nickel metal decoration on the activated carbon storage of carbon dioxide and methane

Fabrication of microporous and mesoporous carbon spheres for high-performance supercapacitor electrode materials

Pressureless and Low-Pressure Synthesis of Microporous Carbon Spheres Applied to CO2 Adsorption

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Comparative Study of Textural Characteristics on Methane Adsorption for Carbon Spheres Produced by CO₂Activation