CO2 adsorption capacity and kinetics in nitrogen-enriched activated carbon fibers prepared by different methods

Díez, Noel; Álvarez, Patricia; Granda, Marcos; Blanco, Clara; Santamarı́a, Ricardo; Menéndez, Rosa

doi:10.1016/j.cej.2015.06.126

Cited by 71 publications

(23 citation statements)

References 28 publications

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“…The use of monoethanolamine (MEA) is very popular among the other available absorbents. However, despite the merits and popularity, absorption exhibits some inherent short-comings ((such as lack of portability, water-intensiveness and high regeneration cost (Diez et al, 2015;Yu et al, 2015;Gao et al, 2016;Zhou et al, 2016) thereby making an imperative need for a viable alternative. Among the potentially promising alternative technologies available is adsorption, especially for CO 2 capture from point sources (Xiao et al, 2011;Dali et al, 2012;Ma et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Adelodun

Ngila

Kim

et al. 2016

Aerosol Air Qual. Res.

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Detailed assessments of adsorption properties (isotherm, thermodynamics and kinetics) were carried out on chemically modified activated carbon (AC). Some pretreatment methods prior amination have been used to improve the CO 2 selective capture of AC in our previous works. Here, the inter-relationships among the adsorption properties were further investigated and reported. It was found that CO 2 molecules bind onto the heterogeneous surfaces of AC in a monolayer pattern as experimental data fit Freundlich isotherm rather than Langmuir. However, Redlich-Peterson, a 3-parameter model provided the best fit. The highest degree of precision of Chi-square analysis professed it as the most efficient error function for the isotherm study. Values of standard entropy showed to be the most significant thermodynamic limiting parameter in the adsorption process, as physisorption was found predominant for CO 2 collection at the interface. This observation was corroborated with temperature programmed desorption (TPD) analysis where ca. 86% of adsorbed CO 2 were desorbed below 500°C. The kinetic study indicated that CO 2 -AC interaction follows pseudo-second order while the higher R 2 of intraparticle diffusion over Elovich equation confirmed the deduction made from the thermodynamic study. Conclusively, the study of adsorption properties in this work provides useful information for designing proper adsorption reactor and subsequent regeneration of CO 2 -laden adsorbents at environmental levels.

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Section: Introductionmentioning

confidence: 99%

Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Adelodun

Ngila

Kim

et al. 2016

Aerosol Air Qual. Res.

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“…In this line, different types of conformations, sizes, and textures are been considered for CO2 separation, from the broadly used granular activated carbons or monoliths to advanced nanostructured carbon fibers, fabrics, highly hierarchical and ordered molecular sieves, or graphenebased materials (Wahby et al, 2010;Hao et al, 2011;Jiménez et al, 2012;Wei et al, 2012;Srinivas et al, 2014;Balasubramanian and Chowdhury, 2015;Díez et al, 2015).…”

mentioning

confidence: 99%

Biomass Waste Carbon Materials as adsorbents for CO2 Capture under Post-Combustion Conditions

et al. 2016

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A series of porous carbon materials obtained from biomass waste have been synthesized, with different morphologies and structural properties, and evaluated as potential adsorbents for CO2 capture in post-combustion conditions. These carbon materials present CO2 adsorption capacities, at 25°C and 101.3 kPa, comparable to those obtained by other complex carbon or inorganic materials. Furthermore, CO2 uptakes under these conditions can be well correlated with the narrow micropore volume, derived from the CO2 adsorption data at 0°C ( ) V CO 2 DR . In contrast, CO2 adsorption capacities at 25°C and 15 kPa are more related to only pores of sizes lower than 0.7 nm. The capacity values obtained in column adsorption experiments were really promising. An activated carbon fiber obtained from Alcell lignin, FCL, presented a capacity value of 1.3 mmol/g (5.7%wt). Moreover, the adsorption capacity of this carbon fiber was totally recovered in a very fast desorption cycle at the same operation temperature and total pressure and, therefore, without any additional energy requirement. Thus, these results suggest that the biomass waste used in this work could be successfully valorized as efficient CO2 adsorbent, under post-combustion conditions, showing excellent regeneration performance.

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“…The presence of these groups might lead to its higher CO2 capacities. This implied that the CO2 adsorption capacities might be subject to not only the nitrogen content but also the type and the location of N-functionalities [6,21,34]. According to the results of Qst (Figure 6d), estimated from the adsorption data, the CO2 adsorption on aACF still behaved as a physical process.…”

Section: Co2 Adsorption Performancementioning

confidence: 86%

Carbon Dioxide Adsorption on Porous and Functionalized Activated Carbon Fibers

2019

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Polyacrylonitrile-based activated carbon fibers (ACFs), modified using potassium hydroxide (KOH) or tetraethylenepentamine (TEPA), were investigated for carbon dioxide (CO2) adsorption, which is one of the promising alleviation approaches for global warming. The CO2 adsorption isotherms were measured, and the values of isosteric heat of adsorption were calculated. The results showed that the KOH-modified ACFs exhibited a great deal of pore volume, and a specific surface area of 1565 m2/g was obtained. KOH activation made nitrogen atoms easily able to escape from the surface of ACFs. On the other hand, the surface area and pore volume of ACFs modified with TEPA were significantly reduced, which can be attributed to the closing or blocking of micropores by the N-groups. The CO2 adsorption on the ACF samples was via exothermic reactions and was a type of physical adsorption, where the CO2 adsorption occurred on heterogeneous surfaces. The CO2 uptakes at 1 atm and 25 °C on KOH-activated ACFs reached 2.74 mmole/g. This study observed that microporosity and surface oxygen functionalities were highly associated with the CO2 uptake, implying the existence of O-C coordination, accompanied with physical adsorption. Well cyclability of the adsorbents for CO2 adsorption was observed, with a performance decay of less than 5% over up to ten adsorption-desorption cycles.

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CO2 adsorption capacity and kinetics in nitrogen-enriched activated carbon fibers prepared by different methods

Cited by 71 publications

References 28 publications

Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Biomass Waste Carbon Materials as adsorbents for CO2 Capture under Post-Combustion Conditions

Carbon Dioxide Adsorption on Porous and Functionalized Activated Carbon Fibers

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