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Issue 44, 2016
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Fabrication of nitrogen-doped porous carbons for highly efficient CO2 capture: rational choice of a polymer precursor

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Abstract

Because of the high stability, tailorable surface properties, and plentiful porosity, nitrogen-doped porous carbons (NPCs) are of great interest for CO2 capture. Carbonization of nitrogen-containing polymers is regularly utilized for the fabrication of NPCs, but such a method is obstructed by the high cost of some polymer precursors. Here we demonstrate the preparation of NPCs via the rational choice of a low-priced, nitrogen-rich polymer NUT-1 (NUT represents Nanjing Tech University) as the precursor, for the first time. The polymer NUT-1 was synthesized by the polymerization of two easily available monomers under mild conditions without the use of any catalysts. Carbonization at temperatures ranging from 500 to 800 °C leads to the generation of a series of NPCs possessing various porosity and nitrogen contents. The adsorption performance of NPCs is dependent on their pore structure and nitrogen-doped “CO2-philic” sites, while the sample with the largest surface area does not exhibit the highest adsorption amount of CO2. In the case of the material prepared at 600 °C (NPC-1-600), the CO2 adsorption amount can reach 7.5 mmol g−1 at 273 K and 1 bar, which is much higher than that of some benchmark materials, including 13X zeolite (4.1 mmol g−1) and activated carbon (2.8 mmol g−1), and most if not all reported carbon-based adsorbents. We also demonstrate that KOH plays an important role in the formation of abundant porosity. The reference material NPC-1-600r prepared in the absence of KOH can only adsorb 3.2 mmol CO2 g−1 at 273 K and 1 bar, which is obviously lower than its counterpart NPC-1-600 (7.5 mmol g−1). Our materials may offer to be promising candidates for carbon capture from gas mixtures including natural gas and flue gas.

Graphical abstract: Fabrication of nitrogen-doped porous carbons for highly efficient CO2 capture: rational choice of a polymer precursor

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Publication details

The article was received on 25 Aug 2016, accepted on 03 Oct 2016 and first published on 18 Oct 2016


Article type: Paper
DOI: 10.1039/C6TA07305K
Citation: J. Mater. Chem. A, 2016,4, 17299-17307
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    Fabrication of nitrogen-doped porous carbons for highly efficient CO2 capture: rational choice of a polymer precursor

    J. Kou and L. Sun, J. Mater. Chem. A, 2016, 4, 17299
    DOI: 10.1039/C6TA07305K

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