Assessment of CO2 adsorption capacity on activated carbons by a combination of batch and dynamic tests

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Title: Assessment of CO2 adsorption capacity on activated carbons by a combination of batch and dynamic tests
Authors: Balsamo, Marco | Silvestre Albero, Ana | Silvestre-Albero, Joaquín | Erto, Alessandro | Rodríguez Reinoso, Francisco | Lancia, Amedeo
Research Group/s: Materiales Avanzados
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: CO2 | Adsorption | Activated carbon | Carbon capture and storage | Global warming
Knowledge Area: Química Inorgánica
Issue Date: 30-Apr-2014
Publisher: American Chemical Society
Citation: Langmuir. 2014, Just Accepted Manuscript. doi:10.1021/la500780h
Abstract: In this work, batch and dynamic adsorption tests are coupled for an accurate evaluation of CO2 adsorption performance for three different activated carbons obtained from olives stones by chemical activation followed by physical activation with CO2 at varying times, i.e. 20, 40 and 60 h. Kinetic and thermodynamic CO2 adsorption tests from simulated flue-gas at different temperature and CO2 pressure are carried out both in batch (a manometric equipment operating with pure CO2) and dynamic (a lab-scale fixed-bed column operating with CO2/N2 mixture) conditions. The textural characterization of the activated carbon samples shows a direct dependence of both micropore and ultramicropore volume on the activation time, hence AC60 has the higher contribution. The adsorption tests conducted at 273 and 293 K showed that, when CO2 pressure is lower than 0.3 bar, the lower the activation time the higher CO2 adsorption capacity and a ranking ωeq(AC20)>ωeq(AC40)>ωeq(AC60) can be exactly defined when T= 293 K. This result can be likely ascribed to a narrower pore size distribution of the AC20 sample, whose smaller pores are more effective for CO2 capture at higher temperature and lower CO2 pressure, the latter representing operating conditions of major interest for decarbonation of a flue-gas effluent. Moreover, the experimental results obtained from dynamic tests confirm the results derived from the batch tests in terms of CO2 adsorption capacity. It is important to highlight that the adsorption of N2 on the synthesized AC samples can be considered negligible. Finally, the importance of a proper analysis of characterization data and adsorption experimental results is highlighted for a correct assessment of CO2 removal performances of activated carbons at different CO2 pressure and operating temperature.
ISSN: 0743-7463 (Print) | 1520-5827 (Online)
DOI: 10.1021/la500780h
Language: eng
Type: info:eu-repo/semantics/article
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Peer Review: si
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Appears in Collections:INV - LMA - Artículos de Revistas

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