Boosting selective C2H2/CH4, C2H4/CH4 and CO2/CH4 adsorption performance via 1,2,3-triazole functionalized triazine-based porous organic polymers

Nitrogen-rich porous organic polymers have shown great potentials in gas adsorption/separation, photocatalysis, electrochemistry, sensing and so on. Herein, 1,2,3-triazole functionalized triazine-based porous organic polymers (TT-POPS) have been synthesized by the copper-catalyzed azide-alkyne cycloaddition (Cu-AAC) polymerization reactions of 1,3,5-tris(4-azidophenyL)-triazine with 1,4-diacetylene benzene and 1,3,5-triacetylenebenzene, respectively. The characterizations of N-2 adsorption at 77 K show TT-POPs possess permanent porosity with BET surface areas of 666 m(2).g(-1) (TT-POP-1) and 406 m(2).g(-1) (TT-POP-2). The adsorption capacities of TT-POPs for CO2, CH4, C2H2 and C2H4, as well as the selective separation abilities of CO2/N-2, CO2/CH4, C2H2/CH4 and C2H4/CH4 were evaluated. The gas selective separation ratio of TT-POPs was calculated by the ideal adsorbed solution theory (IAST) method, wherein the selective separation ratios of C2H2/CH4 and C2H4/CH4 of IT-POP-2 was 48.4 and 13.6 (298 K, 0.1 MPa), which is comparable to other adsorbents (5.6-120.6 for C2H2/CH4, 10-26 for C2H4/CH4). This work shows that the 1,2,3-triazole functionalized triazine-based porous organic polymer has a good application prospect in natural gas purification. (C) 2021 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.

Automated summary

In this study, 1,2,3-triazole functionalized triazine-based porous organic polymers (TT-POPs) were successfully synthesized and their adsorption and separation properties were evaluated. The results showed that TT-POPs have great potential for natural gas purification.