2, Dalian University of Technology, Dalian, , China
The development of effective technologies or strategies for capturing or eliminating CO2 produced from various processes in order to minimize its influence on climate change remains an urgent and challenging task. To address this issue, in this present study, we have designed and synthesized a novel nitrogen-rich heteroaromatic tetranitrile, namely 4,4',4'',4'''-(1,4-phenylenebis(pyridine-4,2,6-triyl))tetrabenzonitrile, to prepare a set of nitrogen-rich CTFs as high-performance platforms for selective gas sorption and storage. The influence of several parameters such as the ZnCl2/monomer ratio and reaction temperature on the structure and porosity of the resulting frameworks was systematically examined. Remarkably, the CTF material obtained using 20 molar equiv. of ZnCl2 at the reaction temperature of 400 oC exhibits an excellent CO2 adsorption capacity (3.48 mmol/g at 273 K and 1 bar) as well as a significant high H2 uptake (1.5 wt% at 77 K and 1 bar). These values are among the top levels for all the CTFs measured under identical conditions to date. In addition, the obtained CTFs also present a relatively high CO2/N2 selectivity (up to 36 at 298 K) making them promising adsorbents for gas sorption and separation.