摘要
煤层气中CH_(4)/N_(2)的高效分离对“双碳”目标的实现和低碳能源的补充具有重要意义。利用我国丰富的煤炭资源制备煤基多孔炭材料,可用于煤层气中CH_(4)/N_(2)的吸附分离。使用高煤化度煤作为炭前驱体原料,在盐酸与氢氟酸的作用下进行脱灰处理,与KOH研磨混匀并在氮气氛围下高温活化,制备出煤基多孔炭材料吸附分离CH_(4)/N_(2)。研究结果表明,在碱(KOH)煤比为2∶2,活化温度为800℃,脱灰煤制备的多孔炭BET比表面积为1307 m^(2)/g,孔径集中在0.54 nm处,在1×10^(5)Pa、298 K下对甲烷的吸附量为27.6 cm^(3)/g,IAST选择性为4.43,远高于相同实验和测试条件下未脱灰煤多孔炭的气体吸附分离性能;基于IAST选择性使用ASPEN软件模拟了CH_(4)/N_(2)(50%/50%)二元混合气的穿透实验,两者长的穿透时间间隔(50 s)表明脱灰煤制备的多孔炭材料具有实际的分离效果。
The efficient separation of CH_(4)/N_(2)from coalbed methane(CBM)is of great significance for the realization of the"double carbon"goal and the supplementation of low-carbon energy.Coal-based porous carbon materials can be prepared by utilizing China′s abundant coal resources and can be used for the adsorption and separation of CH_(4)/N_(2)in CBM.In this paper,coal-based porous carbon materials were prepared for the adsorption and separation of CH_(4)/N_(2)by using highly coalized coal as raw material,which was treated with hydrofluoric acid de-ashing,mixed with KOH and activated at high temperature.The results of the study showed that the BET specific surface area of the porous carbon prepared from de-ashed coal was 1307 m^(2)/g at an alkali(KOH)to coal ratio of 2∶2 and an activation temperature of 800℃,and the pore size was concentrated at 0.54 nm.The adsorption capacity of methane at 1×10^(5)Pa and 298 K is 27.6 cm^(3)/g,and the IAST selectivity is 4.43,which is much higher gas adsorption and separation performance than that of undeashed coal-based porous carbon under the same experimental and testing conditions.Penetration experiments of CH_(4)/N_(2)(50%/50%)binary mixtures were simulated based on IAST selectivity using ASPEN software,and the long penetration time interval(50 s)between the two suggests that the porous carbon materials prepared from de-ashed coal are practically effective for separation.
作者
金晓宇
刘晋芳
景佳鑫
董晓宇
时勇
李海燕
荀文杰
王玉高
杨江峰
JIN Xiaoyu;LIU Jinfang;JING Jiaxin;DONG Xiaoyu;SHI Yong;LI Haiyan;XUN Wenjie;WANG Yugao;YANG Jiangfeng(Shanxi Coking Coal Group Coking Coal Clean Utilization Co.,Ltd.,Taiyuan 030024,China;College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Coking Coal FenXi Mining Industry,Lvliang 033000,China;Shanxi ShuGuang Coal Mine,Lvliang 033000,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2024年第S01期392-398,共7页
Clean Coal Technology
基金
山西省自然科学基金资助项目(202203021221069)
山西焦煤炼焦煤清洁利用实验室资助项目
