With the increase of man-made emissions, CO2 capture after combustion has become a key component of greenhouse gas emission reduction. The search for a better CO2 capture material has caused great attention and nitrogen-doped porous carbon materials are considered as one of the most promising candidates. However, traditional preparation methods of nitrogen-doped porous carbon materials suffer from the shorts of complex process, harsh reaction conditions and low product yield. Using ionic liquids as the raw materials to synthesize nitrogen-doped porous carbon materials through ionothermal cyclotrimerization is a simplified and high-yield manner. In the present works, a series of nitrogen-doped porous carbon materials were synthesized directly by high temperature carbonization using cyano ionic liquids as raw material. By varying the structure and anions of the ionic liquid precursor and synthesis conditions, the pore architecture and surface functional groups of the materials could be controlled. The ionic liquid precursors were characterized by 1H-NMR, CHN element analysis and thermogravimetric analysis (TGA). The nanostructure of the porous carbon materials were observed by Transmission Electron Microscope (TEM) and the types of N-containing groups of the carbon material were investigated by X-ray photoelectron spectroscopy (XPS). The N element content was confirmed by elements analysis. The pore structures were evaluated by Brunauer–Emmett–Teller (BET) nitrogen sorption isotherms measured at 77 K. CO2 adsorption performance of these materials was carried out on a gravimetric microbalance (IGA). Combing the BET results and TGA analysis showed that the anions of ionic liquids acted as the template agent in the process of polymerization. These nitrogen-doped porous carbon materials mainly had mesoporous structure and the highest specific surface area reached to 732.6 m2/g. The highest N content reached to 9.9wt%. Owing to strong interactions between the CO2 molecules and nitrogen-containing basic sites, the highest CO2 adsorption quantity reached to 20.9wt% under 1.8 MPa at 25℃. The materials could be completely regenerated under the vacuum at 180℃, indicating its good stability.
Jiahui LIU Huiting LIU Guoying ZHAO Zhenyu SUN
. Ionic liquids self-templating to synthesize nitrogen-doped porous carbon materials for CO2 adsorption[J]. The Chinese Journal of Process Engineering, 2020
, 20(1)
: 108
-115
.
DOI: 10.12034/j.issn.1009-606X.219164
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