Facile preparation of nitrogen-doped microporous carbon from potassium citrate/urea for effective CH4 separation and uptake

Herein, we have developed a new activation method to convert the hydrothermal carbon of cellulose by means of potassium citrate and urea into a carbon material with well-developed micropores and a high N content, which is capable of separating and enriching CH4. [Display omitted] •C6H5K3O7 was first...

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Bibliographic Details
Published in:Fuel (Guildford) 2023-11, Vol.351, p.128915, Article 128915
Main Authors: Zhang, Li, Dong, Yonggang, Zhang, Dan, Li, Wenfei, Qin, Hong, Luo, Ziming, Shi, Yongyong, Lv, Yutao, Zhang, Cuiwei, Pan, Hongyan, Lin, Qian
Format: Article
Language:English
Subjects:
Adsorption separation
N-doped microporous carbon
Pore-forming mechanism
Potassium citrate
Thermodynamics
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Summary:Herein, we have developed a new activation method to convert the hydrothermal carbon of cellulose by means of potassium citrate and urea into a carbon material with well-developed micropores and a high N content, which is capable of separating and enriching CH4. [Display omitted] •C6H5K3O7 was first used to prepare ultra-microporous carbon materials.•The mechanism of activated carbon prepared by C6H5K3O7 and CH4N2O was proposed.•The micropore and nitrogen content are determined by the feed ratio.•Materials with higher micropores and N% have the maximum CH4 adsorption capacity.•Study on the thermodynamics of methane adsorption. N-doped microporous carbons have attracted much attention for micromolecule gas separation and accumulation owning to their superior adsorption potential and surface polarizability. However, to prepare N-doped microporous carbon usually acquire excess corrosive KOH as activator, which limits its application in industry. Here, we propose a non-corrosion method for the manufacture of narrow N-doped microporous carbons using potassium citrate acts as activating agent, and urea acts as both a nitrogen doping agent and coactivator without any solvent. The BET surface area, micropore volume, pore size distribution and N content can be easily adjusted by changing the potassium citrate/urea ratio and activating temperature. The influence of porous structure and N content on CH4 uptake and separation was investigated, and ultra-micropore volume (
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2023.128915