Oxygen-rich porous carbons from carbonyl modified hyper-cross-linked polymers for efficient CO2 capture

A series of carbonyl modified hyper-cross-linked polymers (HCPs) with different porosity was prepared and they were carbonized for production of oxygen-rich porous carbons. The results show that these carbons have high Brunauer-Emmett-Teller (BET) surface area (440-1769 m(2)/g) and outstanding microporosity (72-87%), the oxygen is greatly improved after the carbonization with the oxygen content of 20.7-29.2 wt%. The CO2 uptake of PDVC-700-1 is the highest with the value of 303 mg/g at 273 K and 1.0 bar and PDV-pc has the highest CO2/N-2 selectivity of 46.8. Interestingly, the CO2 adsorption is linear correlated to the ultramicropore volume (d < 1.0 nm) with the correlation coefficient of 0.9935 (273 K, 1.0 bar) and the O content also plays a role in CO2 adsorption. These porous carbons have medium adsorption heat (28.5-34.9 kJ/mol) with an excellent desorption and repeated use performance.