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Issue 7, 2013
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Critical role of small micropores in high CO2 uptake

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Microporous carbon materials with extremely small pore size are prepared by employing polyaniline as a carbon precursor and KOH as an activating agent. CO2 sorption performance of the materials is systematically investigated at the temperatures of 0, 25 and 75 °C. The prepared carbons show very high CO2 uptake of up to 1.86 and 1.39 mmol g−1 under 1 bar, 75 °C and 0.15 bar, 25 °C, respectively. These values are amongst the highest CO2 capture amounts of the known carbon materials. The relation between CO2 uptake and pore size at different temperatures is studied. An interesting and innovative point that the micropores with pore size smaller than a critical value play a crucial role in CO2 adsorption at different temperatures is demonstrated. It is found that the higher the sorption temperature is, the smaller this critical value of pore size is. Pores smaller than 0.54 nm are manifested to determine CO2 capture capacity at high sorption temperature, e.g. 75 °C. This research proposes a basic principle for designing highly efficient CO2 carbon adsorbents; that is, the adsorbents should be primarily rich in extremely small micropores.

Graphical abstract: Critical role of small micropores in high CO2 uptake

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Article information

12 Aug 2012
12 Dec 2012
First published
12 Dec 2012

Phys. Chem. Chem. Phys., 2013,15, 2523-2529
Article type

Critical role of small micropores in high CO2 uptake

Z. Zhang, J. Zhou, W. Xing, Q. Xue, Z. Yan, S. Zhuo and S. Z. Qiao, Phys. Chem. Chem. Phys., 2013, 15, 2523
DOI: 10.1039/C2CP44436D

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