2024-03-28T20:16:23Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1709402018-11-15T08:02:57Zcom_10261_84com_10261_5col_10261_337
Low-cost hierarchical micro/macroporous carbon foams as efficient sorbents for CO2 capture
Rodríguez Vázquez, Elena
García Fernández, Roberto
Rodríguez Vázquez, Elena [0000-0001-6835-0371]
Carbon foams
Carbon dioxide
Chemical activation
Hierarchical coal-based carbon foams with a low production cost and a high carbon yield have been synthesised using ZnCl2 and KOH as activation agents and tested as adsorbents for CO2, and a relation has been established between CO2 uptake and their textural and chemical properties. The foams showed a porous structure consisting of macropores in the range of 100–10 μm, a surface area of 534–866 m2 g− 1 and a total micropore volume of 0.21–0.25 cm3 g− 1. The foams activated with ZnCl2 at 500 °C, which displayed a homogeneous microporosity in the range of 0.8–1.2 nm, showed moderate values of CO2 uptake, ranging from 1.6 to 2.1 mmol g− 1. The CO2 adsorption capacity of the foams prepared by KOH activation was as high as 2.8 mmol g− 1, as a result of their higher proportion of narrow micropores (< 0.7 nm). This value is superior to those attained by commercial activated carbons and the highest ever reported for carbon foams. Regarding the chemical surface, the presence of acidic functionalities reduced the uptake of CO2. The foam prepared with a low coal/KOH ratio (0.5) showed a very good selectivity for CO2 adsorption over N2, a low regeneration energy expenditure and a good recyclability.
2018-10-11T09:18:06Z
2018-10-11T09:18:06Z
2016-09-16
artículo
Fuel Processing Technology 156: 235-245 (2017)
0378-3820
http://hdl.handle.net/10261/170940
10.1016/j.fuproc.2016.09.002
eng
Postprint
https://doi.org/10.1016/j.fuproc.2016.09.002
Sí
https://creativecommons.org/licenses/by-nc-nd/4.0/
openAccess
Elsevier