时间: 2022-11-10 | 次数: |
高雅茹, 王燕, 李瑶.柔性氮掺杂活性多孔碳布的制备及其对CO2/CH4吸附分离和甲醇吸附研究[J].河南理工大学学报(自然科学版),2022,41(6):45-53.
GAO Y R, WANG Y, LI Y.Study on flexible N-doped activated porous carbon cloth preparation and its CO2/CH4 adsorption separation and methanol adsorption[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(6):45-53.
柔性氮掺杂活性多孔碳布的制备及其对CO2/CH4吸附分离和甲醇吸附研究
高雅茹1, 王燕1, 李瑶1,2
1.河南理工大学 安全科学与工程学院,河南 焦作 454000;2.河南理工大学 河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地,河南 焦作 454000
摘要:开发一种用于吸附和分离CO2/CH4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CO2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 m3/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CO2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CO2/CH4(体积比为50/50),FPCC-A-800的CO2/CH4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0.009 5 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(1 159 cm2/g)和总孔体积(0.54 cm3/g)。活化温度700 ℃时制备的FPCC-A-700具有较高的含氮量,在低压范围展现出最优的CO2/CH4分离性能,根据Henry定律,25 ℃时其CO2/CH4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。
关键词:柔性;氮掺杂;活性多孔碳布;CO/CH吸附分离;甲醇吸附
doi:10.16186/j.cnki.1673-9787.2021040078
基金项目: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)
收稿日期:2021/04/19
修回日期:2021/09/03
出版日期:2022/11/25
Study on flexible N-doped activated porous carbon cloth preparation and its CO2/CH4 adsorption separation and methanol adsorption
GAO Yaru1, WANG Yan1, LI Yao1,2
1.School of Safety Science and Engineering,Henan PolytechnicUniversity,Jiaozuo 454000,Henan,China;2.Key Laboratory of Gas Geology and Gas Governance of Henan Province,Henan Polytechnic University,Jiaozuo 454000,Henan,China
Abstract:In order to develop an economical,efficient and safe nano-porous carbon material for the adsorption and separation of CO2/CH4 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 CO2 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 m3/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 CO2 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 CO2/CH4(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 0.009 5 MPa,which should be attributed to its maximum specific surface area(1 159 cm2/g) and total pore volume (0.54 cm3/g).The FPCC-A-700 was prepared at the activation temperature of 700 ℃,possessing the highest nitrogen content,and exhibiting the best CO2/CH4 separation performance at lowpressure.According to Henry’s calculation,the CO2/CH4 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.
Key words:flexible;N-doped;activated porous carbon cloth;CO/CH adsorption separation;methanol adsorption