Very high methane uptake on activated carbons prepared from mesophase pitch: A compromise between microporosity and bulk density

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Title: Very high methane uptake on activated carbons prepared from mesophase pitch: A compromise between microporosity and bulk density
Authors: Casco, Mirian Elizabeth | Martinez-Escandell, Manuel | Kaneko, Katsumi | Silvestre-Albero, Joaquín | Rodríguez Reinoso, Francisco
Research Group/s: Materiales Avanzados
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Methane | Activated carbons | Microporosity | Bulk density
Knowledge Area: Química Inorgánica
Issue Date: Nov-2015
Publisher: Elsevier
Citation: Carbon. 2015, 93: 11-21. doi:10.1016/j.carbon.2015.05.029
Abstract: 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.
Sponsor: Authors acknowledge financial support from MINECO: Project MAT2013-45008-p and CONCERT Project-NASEMS (PCIN-2013-057) and Generalitat Valenciana (PROMETEO/2009/002).
ISSN: 0008-6223 (Print) | 1873-3891 (Online)
DOI: 10.1016/j.carbon.2015.05.029
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015 Published by Elsevier Ltd.
Peer Review: si
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