Nitrogen-Doped Coal Tar Pitch Based Microporous Carbons with Superior CO_2 Capture Performance

摘要

Coal tar pitch based nitrogen-doped porous carbons were developed by FeCl3 activation for enhanced CO2 capture. The carbon materials, synthesized with different FeCl3/carbon precursor mass ratios and activation temperatures, exhibit high porosity, especially microporosity, and nitrogen species contents, leading to superior CO2 adsorption capacities in the range of 3.71-4.58 mmol g(-1) and 5.68-7.18 mmol g(-1) at 25 and 0 degrees C under 1 bar, respectively. In particular, N-AC-600-2 and N-AC-600-3 materials show the highest uptakes of CO2 at 25 and 0 degrees C, respectively, which rank among the best porous carbon sorbents. The nitrogen-doping and porosity of the fabricated carbons have combined impact on CO2 adsorption. In addition, both excellent regenerability and high CO2/N-2 selectivity were achieved, making these carbon materials promising candidates for large-scale CO2 adsorption.