Tailoring activated carbons from Pinus canariensis cones for post-combustion $ CO_{2} $ capture
Abstract Activated carbons (ACs) from Pinus canariensis cones were developed by KOH chemical activation. The effect of the impregnation KOH/carbonized cones ratio (IR = 1, 2, or 3) and temperature (873, 973, 1073 K) on main chemical, textural, and morphological characteristics of the resulting ACs was systematically examined. $ CO_{2} $ adsorption capacity from gaseous streams was evaluated by gravimetric adsorption tests, and the analysis of breakthrough curves was determined in a packed-bed column at 303 K and atmospheric pressure. Comparison of $ CO_{2} $ adsorption capacities of the ACs at 273 K and 303 K at equilibrium showed that those samples developed at 973 K with IR = 3 (BET surface area ~ 1900 $ m^{2} $ $ g^{−1} $) attained the highest values (6.4 mmol $ g^{−1} $ and 1.9 mmol $ g^{−1} $, respectively), even though the ACs obtained at 1073 K with the same IR exhibited the largest surface area (2200 $ m^{2} $ $ g^{−1} $). Thermodynamic parameters evaluated from $ CO_{2} $ adsorption isotherms determined in the range 273–333 K for the former sample pointed to a physisorption, spontaneous, and exothermic process; isosteric heat of adsorption was also estimated for the range of surface coverage of the equilibrium isotherms. The kinetics of $ CO_{2} $ adsorption onto all the ACs was successfully described by the linear driving force model. The breakthrough curves were properly represented by the Thomas’ model, the longest breakthrough time and highest adsorption capacity being also attained for the bed packed with the ACs developed at 973 K with IR = 3. Higher $ CO_{2} $ adsorption capacities of the ACs were directly related to the presence of narrow micropores (< 0.9 nm) induced by the stronger activation conditions. However, an excessively severe combination of the IR and activation temperature exerted a negative influence on $ CO_{2} $ adsorption onto the ACs, likely due to micropores widening..
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2020 |
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| Erschienen: |
2020 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:27 |
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| Enthalten in: |
Environmental science and pollution research - 27(2020), 12 vom: 08. Feb., Seite 13915-13929 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Gomez-Delgado, Edward [VerfasserIn] |
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| Links: |
Volltext [lizenzpflichtig] |
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| Themen: |
Activated carbons |
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| Anmerkungen: |
© Springer-Verlag GmbH Germany, part of Springer Nature 2020 |
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| doi: |
10.1007/s11356-020-07830-4 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
OLC2117334113 |
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| 520 | |a Abstract Activated carbons (ACs) from Pinus canariensis cones were developed by KOH chemical activation. The effect of the impregnation KOH/carbonized cones ratio (IR = 1, 2, or 3) and temperature (873, 973, 1073 K) on main chemical, textural, and morphological characteristics of the resulting ACs was systematically examined. $ CO_{2} $ adsorption capacity from gaseous streams was evaluated by gravimetric adsorption tests, and the analysis of breakthrough curves was determined in a packed-bed column at 303 K and atmospheric pressure. Comparison of $ CO_{2} $ adsorption capacities of the ACs at 273 K and 303 K at equilibrium showed that those samples developed at 973 K with IR = 3 (BET surface area ~ 1900 $ m^{2} $ $ g^{−1} $) attained the highest values (6.4 mmol $ g^{−1} $ and 1.9 mmol $ g^{−1} $, respectively), even though the ACs obtained at 1073 K with the same IR exhibited the largest surface area (2200 $ m^{2} $ $ g^{−1} $). Thermodynamic parameters evaluated from $ CO_{2} $ adsorption isotherms determined in the range 273–333 K for the former sample pointed to a physisorption, spontaneous, and exothermic process; isosteric heat of adsorption was also estimated for the range of surface coverage of the equilibrium isotherms. The kinetics of $ CO_{2} $ adsorption onto all the ACs was successfully described by the linear driving force model. The breakthrough curves were properly represented by the Thomas’ model, the longest breakthrough time and highest adsorption capacity being also attained for the bed packed with the ACs developed at 973 K with IR = 3. Higher $ CO_{2} $ adsorption capacities of the ACs were directly related to the presence of narrow micropores (< 0.9 nm) induced by the stronger activation conditions. However, an excessively severe combination of the IR and activation temperature exerted a negative influence on $ CO_{2} $ adsorption onto the ACs, likely due to micropores widening. | ||
| 650 | 4 | |a Activated carbons | |
| 650 | 4 | |a Chemical activation | |
| 650 | 4 | |a Pine cones | |
| 650 | 4 | |a Greenhouse gases | |
| 650 | 4 | |a CO | |
| 650 | 4 | |a adsorption | |
| 650 | 4 | |a Narrow microporosity | |
| 700 | 1 | |a Nunell, Gisel |4 aut | |
| 700 | 1 | |a Cukierman, Ana Lea |4 aut | |
| 700 | 1 | |a Bonelli, Pablo |4 aut | |
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| 773 | 1 | 8 | |g volume:27 |g year:2020 |g number:12 |g day:08 |g month:02 |g pages:13915-13929 |
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