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Cherry-stones-based activated carbons as potential adsorbents for CO2/CH4 separation: effect of the activation parameters

AutorÁlvarez Gutiérrez, Noelia ; Gil Matellanes, María Victoria ; Rubiera González, Fernando ; Pevida García, Covadonga
Palabras claveActivated carbon
Cherry stones
CO2/CH4 separation
CO2 uptake
Response surface methodology
Fecha de publicación9-sep-2015
EditorWiley-VCH
CitaciónGreenhouse Gases: Science and Technology 5(6): 812–825 (2015)
ResumenA low-cost biomass, cherry stones (CS), was used as a carbon precursor to synthesize two activated carbons to be used for CO2/CH4 separation. Single-step activation with two activating agents, carbon dioxide and steam, was used. The activation conditions that maximize the CO2 adsorption capacity by the adsorbents at 25 ºC and atmospheric pressure were determined by response surface methodology (RSM). The optimum values were 885 ºC and 12% of solid yield when activating with carbon dioxide, but 850 ºC and 15.3% of solid yield when activating with steam. Heating rate did not show a significant effect on the CO2 uptake. CO2 adsorption capacity values up to 11.45 and 10.56 wt.% were achieved under such conditions using carbon dioxide and steam as activating agents, respectively. Carbon dioxide activation promoted the development of microporosity, whereas both micropores and mesopores were developed during steam activation. The CO2/CH4 separation performance at 3 bar of the optimum adsorbents indicated that both cherry-stones-based activated carbons could have great potential as CO2 adsorbents for CO2/CH4 separation. The adsorbent activated with carbon dioxide, CS-CO2, showed a slightly higher adsorption capacity, but the steam-activated sample, CS-H2O, had an enhanced selectivity to separate CO2 from CO2/CH4 binary mixtures.
DescripciónThis is the accepted version of the following article: Álvarez-Gutiérrez, N., Victoria Gil, M., Rubiera, F. and Pevida, C. (2015), Cherry-stones-based activated carbons as potential adsorbents for CO2/CH4 separation: effect of the activation parameters. Greenhouse Gas Sci Technol, 5: 812–825. doi: 10.1002/ghg.1534, which has been published in final form at http://dx.doi.org/10.1002/ghg.1534
Versión del editorhttp://dx.doi.org/10.1002/ghg.1534
URIhttp://hdl.handle.net/10261/139422
DOI10.1002/ghg.1534
ISSN2152-3878
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