Jump to main content
Jump to site search

Issue 5, 2011
Previous Article Next Article

Sustainable porous carbons with a superior performance for CO2 capture

Author affiliations

Abstract

Sustainable porous carbons have been prepared by chemical activation of hydrothermally carbonized polysaccharides (starch and cellulose) and biomass (sawdust). These materials were investigated as sorbents for CO2 capture. The activation process was carried out under severe (KOH/precursor = 4) or mild (KOH/precursor = 2) activation conditions at different temperatures in the 600–800 °C range. Textural characterization of the porous carbons showed that the samples obtained under mild activating conditions exhibit smaller surface areas and pore sizes than those prepared by employing a greater amount of KOH. However, the mildly activated carbons exhibit a good capacity to store CO2, which is mainly due to the presence of a large number of narrow micropores (<1 nm). A very high CO2 uptake of 4.8 mmol·g−1 (212 mg CO2·g−1) was registered at room temperature (25 °C) for a carbon activated at 600 °C using KOH/precursor = 2. To the best of our knowledge, this result constitutes the largest ever recorded CO2 uptake at room temperature for any activated carbon. Furthermore, we observed that these porous carbons have fast CO2 adsorption rates, a good selectivity for CO2–N2 separation and they can be easily regenerated.

Graphical abstract: Sustainable porous carbons with a superior performance for CO2 capture

Back to tab navigation

Article information


Submitted
17 Dec 2010
Accepted
17 Feb 2011
First published
18 Mar 2011

Energy Environ. Sci., 2011,4, 1765-1771
Article type
Paper

Sustainable porous carbons with a superior performance for CO2 capture

M. Sevilla and A. B. Fuertes, Energy Environ. Sci., 2011, 4, 1765
DOI: 10.1039/C0EE00784F

Social activity

Search articles by author

Spotlight

Advertisements