Journal
CARBON
Volume 121, Issue -, Pages 257-266Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2017.05.088
Keywords
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Funding
- Widener University
- Center for Nanophase Materials Sciences, ORNL, which is a DOE Office of Science User Facility [CNMS2016-302]
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Nitrogen-doped and hierarchical porous carbons were synthesized from lignin precursor by KOH and NH3 activation with BET surface area of 1631e2922 m(2)/g. X-ray photoelectron spectroscopy (XPS) revealed 5.6e7.1 at.% nitrogen with predominantly pyridinic, amino and pyrrolic/pyridonic type of functionality. Maximum CO2 adsorption capacity at 298 K and 273 K and pressure upto 760 torr (1 bar) was found to be 5.48 and 8.6 mmol/g respectively, which is higher than that of majority of nitrogendoped carbons, reported in literature. Ideal Adsorbed Solution Theory (IAST)-based selectivity for CO2/N-2 revealed that selectivity increases with the increase in nitrogen content. IAST calculations were also employed to calculate the binary adsorption isotherms to simulate mixed gas adsorption for CO2 and N-2 as a function of total pressure and mole fraction of CO2 in the gas mixture. Continuous CO2 adsorptiondesorption studies for 10 cycles revealed that all the nitrogen-doped carbons retained its working capacity at the end of the cycles. Finally, a breakthrough study for (10/90) CO2/N-2 mixture in a dynamic column experiment confirmed a physical separation of the two components. The overall results suggest that nitrogen-doped carbons from lignin can be used as potential adsorbents for CO2 capture purposes. (C) 2017 Elsevier Ltd. All rights reserved.
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