摘要
开发一种用于吸附和分离CO_(2)/CH_(4)以及吸附甲醇的经济、高效、安全的纳米多孔碳材料,以黏胶纤维织物为前体物质,以CO_(2)为活化剂,采用一步碳化-活化方法制备柔性氮掺杂活性多孔碳布,并探讨活化温度对多孔碳孔隙结构发育和化学成分的影响。结果表明,活化温度800℃时制备的FPCC-A-800超微孔体积为0.29 m^(3)/g,占总孔体积的71%,含氮量为5.88%。在25℃和0.1 MPa压力下,FPCC-A-800对CO_(2)的吸附量最高为3.13 mmol/g,根据理想吸附溶液理论(IAST),计算二元混合气体CO_(2)/CH_(4)(体积比为50/50),FPCC-A-800的CO_(2)/CH_(4)选择性为2.35,这归因于FPCC-A-800优异的超微孔结构和适中的含氮量协同作用。活化温度900℃时制备FPCC-A-900,在25℃和0.0095 MPa压力下其甲醇吸附量可达9.90 mmol/g,这是因为它具有最大的比表面积(1159 cm^(2)/g)和总孔体积(0.54 cm^(3)/g)。活化温度700℃时制备的FPCCA-700具有较高的含氮量,在低压范围展现出最优的CO_(2)/CH_(4)分离性能,根据Henry定律,25℃时其CO_(2)/CH_(4)选择性系数为3.36。实验表明,制备的柔性氮掺杂活性多孔碳布在治理温室气体、提高煤层气利用率和吸附工业甲醇等方面均具有较好的应用前景。
In order to develop an economical,efficient and safe nano-porous carbon material for the adsorp⁃tion and separation of CO_(2)/CH_(4) and the adsorption of methanol,one-step carbonization/activation process was adopted to prepare the flexible nitrogen-doped activated porous carbon cloths via selecting viscose fiber fabric as the precursor and CO_(2) as active agent,and the effect of activation temperature on the development of porosity structure and chemical composition of porous carbon was analyzed.The results showed that the FPCC-A-800 was prepared at the activation temperature of 800℃,possessing ultra-micropore volume as high as 0.29 m^(3)/g,accounting for 71%of the total pore volume,and the nitrogen content of 5.88%.At 25℃and 0.1 MPa,the FPCC-A-800 has the highest CO_(2) adsorption capacity of 3.13 mmol/g.According to the ideal adsorption solution tdheory(IAST),the selectivity of FPCC-A-800 for binary gas mixture CO_(2)/CH_(4)(the volume ratio 50/50)was calculated to be 2.35,which should be attributed to the synergistic effect between excellent ultra-microporous structure and moderate nitrogen content.The FPCC-A-900 was prepared at the activation temperature of 900℃,possessing the best methanol adsorption capacity of 9.90 mmol/g at 25℃and 0.0095 MPa,which should be attributed to its maximum specific surface area(1159 cm^(2)/g)and total pore volume(0.54 cm^(3)/g).The FPCC-A-700 was prepared at the activation temperature of 700℃,possessing the highest nitrogen content,and exhibiting the best CO_(2)/CH_(4) separation performance at lowpressure.According to Henry’s calculation,the CO_(2)/CH_(4) selectivity coefficient FPCC-A-700 was 3.36 at 25℃.The experiments showed that the as-prepared flexible N-doped active porous carbon cloth had a good application prospect in controlling the greenhouse gas,improving the utilization rate of coalbed methane,and enhancing the adsorption of industrial methanol.
作者
高雅茹
王燕
李瑶
GAO Yaru;WANG Yan;LI Yao(School of Safety Science and Engineering,Henan PolytechnicUniversity,Jiaozuo 454000,Henan,China;Key Laboratory of Gas Geology and Gas Governance of Henan Province,Henan Polytechnic University,Jiaozuo 454000,Henan,China)
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2022年第6期45-53,共9页
Journal of Henan Polytechnic University（Natural Science）
基金
国家自然科学基金资助项目(42002164)
河南省自然科学基金资助项目(202300410171)
中国博士后科学基金资助项目(2018M632775)。
