微型多孔材料
吸附
无机化学
选择性
打赌理论
化学工程
碳纤维
化学
钾
比表面积
材料科学
有机化学
催化作用
复合数
工程类
复合材料
作者
Li Zhang,Yonggang Dong,Dan Zhang,Wenfei Li,Hong Qin,Ziming Luo,Yongyong Shi,Yutao Lv,Cuiwei Zhang,Hongyan Pan,Hongyan Pan
出处
期刊:Fuel
[Elsevier]
日期:2023-11-01
卷期号:351: 128915-128915
被引量:7
标识
DOI:10.1016/j.fuel.2023.128915
摘要
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 (<1nm) plays a dominate role in CH4 selectivity adsorption. ACK2N1 had the largest CH4 adsorption capacity of 3.00 mmol/g and CH4/N2 selectivity of 7.11 at 273.15 K and 100 KPa due to its largest ultra-micropore volume and N content. The adsorption breakthrough, regeneration experiments and adsorption thermodynamics showed that the prepared well-developed N-doped microporous carbons have very good potential for CH4 separation and enrichment from low coal bed methane. Furthermore, the pore formation mechanism of the well microporous carbon materials is proposed.
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