CO2-filling capacity and selectivity of carbon nanopores: synthesis, texture, and pore-size distribution from quenched-solid density functional theory (QSDFT).

Hu X, Radosz M, Cychosz KA, Thommes M (2011)

Publication Status: Published

Publication Type: Journal article

Publication year: 2011

Journal

Environmental Science & Technology American Chemical Society

Book Volume: 45

Pages Range: 7068-74

Journal Issue: 16

DOI: 10.1021/es200782s

Abstract

Porous carbons synthesized by KOH activation of petroleum coke can have high surface areas, over 3000 m(2)/g, and high CO(2) sorption capacity, over 15 wt % at 1 bar. This makes them attractive sorbents for carbon capture from combustion flue gas. Quenched solid density functional theory (QSDFT) analysis of high-resolution nitrogen-sorption data for such materials leads to the conclusion that it is the pores smaller than 1 nm in diameter that fill with high-density CO(2) at atmospheric pressure. Upon increasing pressure, larger and larger pores are filled, up to about 4 nm at 10 bar. An ideal CO(2)/N(2) selectivity of such carbon materials tends to decrease substantially upon increasing pressure, for example, from about 8-10 at 1 bar to about 4-5 at 10 bar. All in all, this work confirms the robust CO(2)-filling properties of porous carbon sorbents, their low-pressure selectivity advantages, and points to the critical role of <1 nm pores that can be controlled with activation conditions.

Authors with CRIS profile

Matthias Thommes

Involved external institutions

Quantachrome Instruments US United States (USA) (US) Zhejiang Normal University (ZJNU) / 浙江师范大学 CN China (CN) University of Wyoming US United States (USA) (US)

How to cite

APA:

Hu, X., Radosz, M., Cychosz, K.A., & Thommes, M. (2011). CO2-filling capacity and selectivity of carbon nanopores: synthesis, texture, and pore-size distribution from quenched-solid density functional theory (QSDFT). Environmental Science & Technology, 45(16), 7068-74. https://doi.org/10.1021/es200782s

MLA:

Hu, Xin, et al. "CO2-filling capacity and selectivity of carbon nanopores: synthesis, texture, and pore-size distribution from quenched-solid density functional theory (QSDFT)." Environmental Science & Technology 45.16 (2011): 7068-74.

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