Journal
NANOMATERIALS
Volume 9, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/nano9020266
Keywords
enhanced N-doped; porous carbon; absorbent; CO2/CH4 and CH4/N-2; selectivity
Categories
Funding
- China Postdoctoral Science Foundation [2018M632775]
- NSFC [U1804156, 51574112, 51874124]
- Henan Province Colleges and Universities Key Research Project [18A620002, 18A150005]
- State Key Laboratory Cultivation Base for Gas Geology and Gas Control (Henan Polytechnic University) [WS2018A05]
- Innovative Research Team in University of Ministry of Education of China [IRT_16R22]
- National Key R&D Program of China [2017YFC0804207]
- Program for Innovative Research Team of Henan Polytechnic University [T2018-2]
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Separation of impurities (CO2 and N-2) from CH4 is an important issue for natural gas alternatives (such as coalbed gas, biogas, and landfill gas) upgrading. It is notably challenging to synthesize high N-doped porous carbon with an appropriate porous structure. In this work, high N content (14.48 wt %) porous carbon with micropore size of 0.52 and 1.2 nm and specific surface area of 862 m(2) g(-1 )has been synthesized from potassium hydroxide (KOH) activated waste wool upon the urea modification. Pure component adsorption isotherms of CO2, CH4, and N-2 are systematically measured on this enhanced N-doped porous carbon at 0 and 25 degrees C, up to 1 bar, to evaluate the gases adsorption capability, and correlated with the Langmuir model. These data are used to estimate the separation selectivities for binary mixtures of CO2/CH4 and CH4/N-2 at different mixing ratios according to the ideal adsorbed solution theory (IAST) model. At an ambient condition of 25 degrees C and 1 bar, the predicted selectivities for equimolar CO2/CH4 and CH4/N-2 are 3.19 and 7.62, respectively, and the adsorption capacities for CO2, CH4, and N-2 are 2.91, 1.01, and 0.13 mmol g(-1), respectively. This report introduces a simple pathway to obtain enhanced N-doped porous carbon with large adsorption capacities for gas separation of CO2/CH4 and CH4/N-2.
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