Very high methane uptake on activated carbons prepared from mesophase pitch: A compromise between microporosity and bulk density
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http://hdl.handle.net/10045/47028
Títol: | Very high methane uptake on activated carbons prepared from mesophase pitch: A compromise between microporosity and bulk density |
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Autors: | Casco, Mirian Elizabeth | Martinez-Escandell, Manuel | Kaneko, Katsumi | Silvestre-Albero, Joaquín | Rodríguez Reinoso, Francisco |
Grups d'investigació o GITE: | Materiales Avanzados |
Centre, Departament o Servei: | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales |
Paraules clau: | Methane | Activated carbons | Microporosity | Bulk density |
Àrees de coneixement: | Química Inorgánica |
Data de publicació: | de novembre-2015 |
Editor: | Elsevier |
Citació bibliogràfica: | Carbon. 2015, 93: 11-21. doi:10.1016/j.carbon.2015.05.029 |
Resum: | Two petroleum residues were pyrolyzed under two different conditions to obtain pitches with low or high mesophase content. The effect of the KOH: precursor ratio and the activation temperature on the packing density and porous texture of the carbons have been studied and optimized. Activated carbons combining high micropore volume (>1 cm3/g) and high packing density (0.7 g/cm3) have been successfully prepared. Regarding excess methane adsorption capacities, the best results (160 cm3 (STP)/cm3 at 25 °C and 3.5 MPa) were obtained using the pitch with the higher content of the more organized mesophase, activated at relatively low temperature (700 °C), with a medium KOH: precursor ratio (3:1). Some of the activated carbons exhibit enhanced adsorption capacity at high pressure, giving values as high as 175 cm3 (STP)/cm3 at 25 °C and 5 MPa and 200 cm3 (STP)/cm3 at 25 °C and 10 MPa (the same amount as in an empty cylinder but at half of the pressure), indicating a contribution of large micropores and narrow mesopores to adsorption at high pressure. The density of methane in pores between 1 and 2.5 nm at pressure up to 10 MPa was estimated to understand their contribution to the total adsorption capacity. |
Patrocinadors: | Authors acknowledge financial support from MINECO: Project MAT2013-45008-p and CONCERT Project-NASEMS (PCIN-2013-057) and Generalitat Valenciana (PROMETEO/2009/002). |
URI: | http://hdl.handle.net/10045/47028 |
ISSN: | 0008-6223 (Print) | 1873-3891 (Online) |
DOI: | 10.1016/j.carbon.2015.05.029 |
Idioma: | eng |
Tipus: | info:eu-repo/semantics/article |
Drets: | © 2015 Published by Elsevier Ltd. |
Revisió científica: | si |
Versió de l'editor: | http://dx.doi.org/10.1016/j.carbon.2015.05.029 |
Apareix a la col·lecció: | INV - LMA - Artículos de Revistas |
Arxius per aquest ítem:
Arxiu | Descripció | Tamany | Format | |
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2015_Casco_etal_Carbon_final.pdf | Versión final (acceso restringido) | 1,05 MB | Adobe PDF | Obrir Sol·licitar una còpia |
2015_Casco_etal_Carbon_accepted.pdf | Accepted Manuscript (acceso abierto) | 1,06 MB | Adobe PDF | Obrir Vista prèvia |
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