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Ultramicroporous carbon with extremely narrow pore distribution and very high nitrogen doping for efficient methane mixture gases upgrading

It is notably challenging to fabricate heavily heteroatom-doped porous carbonaceous materials with narrow ultramicropore size distributions for highly effective mixed-gas separation. In this study, new carbon-based materials with narrow ultramicropore size (95%) and high N doping contents (>10 at...

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Bibliographic Details
Published in:Carbon (New York) 2017-10, Vol.122, p.258-265
Main Authors: Yao, Ke Xin, Chen, Yanli, Lu, Yue, Zhao, Yunfeng, Ding, Yi
Format: Article
Language:English
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Summary:It is notably challenging to fabricate heavily heteroatom-doped porous carbonaceous materials with narrow ultramicropore size distributions for highly effective mixed-gas separation. In this study, new carbon-based materials with narrow ultramicropore size (95%) and high N doping contents (>10 at%) are fabricated through the pyrolysis of a perchloro-substituted porous covalent triazine-based framework (ClCTF). In particular, the sample prepared at 650 °C (ClCTF-1-650) possesses the highest ultramicropores content (98%) and large N content (12 at%) and demonstrates a very high CH4 and CO2 capacity, as well as a low N2 uptake under ambient conditions. The extraordinarily high CH4/N2 and CO2/N2 selectivities correlate with both the ideal adsorption solution theory (IAST) method and performed dynamic separation experiments (breakthrough experiments). The results reported in this study far exceed the CH4/N2 and CO2/N2 selectivities of previously reported carbon-based adsorbents including various nitrogen-doped ones. These results are believed to be associated with the unusually high N content, as well as the suitably narrow ultramicropore size distribution. This report introduces a new pathway to design porous absorbents with precisely controlled ultramicropores for gas separation. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2017.06.073