Charged Covalent Triazine Frameworks for CO2 Capture and Conversion

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The quest for the development of new porous materials addressing both CO2 capture from various sources and its conversion into useful products is a very active research area and also critical in order to develop a more sustainable and environmentally-friendly society. Here, we present the first charged covalent triazine framework (cCTF) prepared by simply heating nitrile functionalized dicationic viologen derivatives under ionothermal reaction conditions using ZnCl2 as both solvent and trimerization catalyst. It has been demonstrated that the surface area, pore volume/size of cCTFs can be simply controlled by varying the synthesis temperature and the ZnCl2, content. Specifically, increasing the reaction temperature led to controlled increase in the mesopore content and facilitated the formation of hierarchical porosity, which is critical to ensure efficient mass transport within porous materials. The resulting cCTFs showed high specific surface areas up to 1247 m(2) g(-1), and high physicochemical stability. The incorporation of ionic functional moieties to porous organic polymers improved substantially their CO2 affinity (up to 133 mg g(-1), at 1 bar and 273 K) and transformed them into hierarchically porous organocatalysts for CO2 conversion. More importantly, the ionic nature of cCTFs, homogeneous charge distribution together with hierarchical porosity offered a perfect platform for the catalytic conversion of CO2 into cyclic carbonates in the presence of epoxides through an atom economy reaction in high yields and exclusive product selectivity. These results clearly demonstrate the promising aspect of incorporation of charged units into the porous organic polymers for the development of highly efficient porous organocatalysts for CO2 capture and fixation.
Publisher
AMER CHEMICAL SOC
Issue Date
2017-03
Language
English
Article Type
Article
Keywords

CARBON-DIOXIDE CAPTURE; POROUS ORGANIC POLYMERS; CONJUGATED MICROPOROUS POLYMERS; IONOTHERMAL SYNTHESIS; SORPTION PROPERTIES; AROMATIC FRAMEWORK; CATIONIC POLYMERS; MOLECULAR CAGES; STORAGE; POLYMERIZATION

Citation

ACS APPLIED MATERIALS & INTERFACES, v.9, no.8, pp.7209 - 7216

ISSN
1944-8244
DOI
10.1021/acsami.6b16769
URI
http://hdl.handle.net/10203/223456
Appears in Collection
EEW-Journal Papers(저널논문)
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