期刊
CHEMICAL ENGINEERING JOURNAL
卷 391, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123579
关键词
Ultramicroporous carbon; Facile synthesis; Nitrogen content; SO2 capture; Selective adsorption
资金
- Center for Understanding and Control of Acid Gas-Induced Evolution of Materials for Energy (UNCAGE-ME), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0012577]
- U.S. Department of Energy, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division
- Natural Science Foundation of Jiangxi Province [20192ACB21016]
Recycling SO2 from industrial tail gas is of great significance to control the environmental issues potentially induced by SO2 emission. In the present work, porous carbons with rich ultramicropores and ultrahigh N contents (11.5-17.3 wt%) were synthesized by directly pyrolyzing the mixtures of glucose and urea at 700 degrees C, without the use of any solvents. The synthesized porous carbons were characterized for porosity, morphology and elemental compositions, and also systematically investigated for SO2 capture performance. It is found that the adsorption of SO2 on synthesized porous carbons shows chemical behavior, owing to the strong acid-based interaction between SO2 and pyridinic N. As consequence, the SO2 capacities of synthesized porous carbons are very high, especially at low pressures (4.16 mmol/g at 296.2 K and 10 kPa). The synthesized porous carbons also display impressive adsorption selectivities for SO2/CO2/N-2 mixed gas, and good reversibility for SO2 adsorption. Thus, it is believed that the synthesized porous carbons are promising candidates for selective and reversible SO2 capture.
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