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Nitrogen-doped microporous carbon materials with uniform pore diameters: Design and applications in CO2 and H2 adsorption
Microporous and Mesoporous Materials ( IF 4.8 ) Pub Date : 2019-12-30 , DOI: 10.1016/j.micromeso.2019.109992
Zhishuang Ma , Zhenzhen Yang , Hongye Zhang , Zhimin Liu

Nitrogen-doped microporous carbon materials (N-MCs) with uniform pore diameters have promising applications in gas absorption, however their fabrication is challenging. Herein, we report a new approach to prepare N-MCs with uniform pore size using azo-linked organic polymers (AOPs) as the N-containing precursors. The AOPs were synthesized via the reactions of 1,3,5-tris(4-nitrophenyl)benzene (TNPB) and melamine (MA), and their N contents were tuned by changing the molar ratios of MA to TNPB. Followed by calcination of the resultant precursors at 800 °C, porous N-MCs were produced, which were characterized by means of different techniques including FT-IR analysis, N2 sorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and elemental analysis. It was demonstrated that the pore diameters of N-MCs could be tuned by changing the MA: TNPB ratio for preparing azo-polymer precursors, and N-MCs with pore size centered at 0.72 and 1.06 nm were obtained. The resultant N-MCs showed excellent CO2 uptake capacity up to 191 mg g−1 at 1 bar and 273 K, with a CO2/N2 selectivity of 58 at 298 K and good H2 adsorption capacity of 14.7 mg g−1 at 77 K.



中文翻译:

孔径均匀的掺氮微孔碳材料:CO 2和H 2吸附的设计与应用

具有均匀孔径的氮掺杂微孔碳材料(N-MCs)在气体吸收方面具有广阔的应用前景,但是其制造具有挑战性。在本文中,我们报告了一种新方法,该方法使用偶氮连接的有机聚合物(AOP)作为含N的前体来制备具有均匀孔径的N-MC。通过1,3,5-三(4-硝基苯基)苯(TNPB)和三聚氰胺(MA)的反应合成AOP,并通过改变MA与TNPB的摩尔比来调节其N含量。随后在800°C下煅烧所得的前体,制得了多孔N-MC,并通过包括FT-IR分析,N 2在内的不同技术对其进行了表征。吸附,X射线衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM)和元素分析。结果表明,可以通过改变制备偶氮聚合物前体的MA:TNPB比例来调节N-MC的孔径,从而制得孔径为0.72和1.06 nm的N-MC。所得的N-MC在1 bar和273 K下表现出优异的CO 2吸收能力,最高可达191 mg g -1,在298 K下的CO 2 / N 2选择性为58,良好的H 2吸附能力为14.7 mg g -1在77 K.

更新日期:2019-12-30
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