Issue 42, 2012

Covalent-organic polymers for carbon dioxide capture

Abstract

Reducing anthropogenic carbon dioxide emission has become an urgent environmental and climate issue of our age. Here, a series of covalent-organic polymers (COPs) are synthesized, and the adsorption properties of these COPs for H2, CO2, CH4, N2 and O2 are studied. The H2 uptake of COP-2 reaches 1.74 wt% at 77 K and 1 bar, which is among the highest reported uptakes in the field of microporous organic polymers under similar conditions, and CO2 and CH4 adsorption capacities are 594 mg g−1 and 78 mg g−1, respectively, at 298 K and 18 bar. Then, based on the single component isotherm, the dual-site Langmuir–Freundlich (DSLF)-based ideal adsorption solution theory (IAST) is used to predict the selectivity of the COP materials for post-combustion (CO2–N2) and pre-combustion (O2–N2) gas mixtures. The IAST predicted results indicate that COP-1 exhibits significantly higher selectivity compared to COP-2, 3 and 4, due to its smaller pore size. In particular, the adsorption selectivity of COP-1 for the CO2–N2 mixture reaches 91 at a CO2 : N2 ratio of 15 : 85 at 298 K and 1 bar, and 2.38 for the 21 : 79 O2–N2 mixture at 298 K and 1 bar. Furthermore, these COPs also show robust properties for the removal of CO2 from natural gas. The adsorption selectivity of COP-1 for CO2–CH4 is in the range of 4.1–5.0 at a CO2 : CH4 ratio of 15 : 85 at 0 < P < 40 bar.

Graphical abstract: Covalent-organic polymers for carbon dioxide capture

Supplementary files

Article information

Article type
Paper
Submitted
13 Aug 2012
Accepted
07 Sep 2012
First published
10 Sep 2012

J. Mater. Chem., 2012,22, 22663-22669

Covalent-organic polymers for carbon dioxide capture

Z. Xiang, X. Zhou, C. Zhou, S. Zhong, X. He, C. Qin and D. Cao, J. Mater. Chem., 2012, 22, 22663 DOI: 10.1039/C2JM35446B

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