张涛, 王彬彬, 李瑶.基于玉米秸秆的氮掺杂多孔碳制备及其对CO₂吸附和CO₂/N₂分离性能研究[J].河南理工大学学报（自然科学版）,2022,41(6):174-180.

ZHANG T, WANG B B, LI Y.Preparation of stalk-based nitrogen-doped porous carbon and its CO₂ adsorption and CO₂/N₂ separation properties[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(6):174-180.

基于玉米秸秆的氮掺杂多孔碳制备及其对CO₂吸附和CO₂/N₂分离性能研究

张涛1, 王彬彬1, 李瑶2,3

1.河南理工大学 材料科学与工程学院，河南 焦作 454000；2.河南理工大学 安全科学与工程学院，河南 焦作 454000；3.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:为解决大气中日益增加的CO₂含量问题，以玉米秸秆为原料，采用水热碳化和KOH活化处理，通过控制KOH活化强度，制备出一系列具有发达孔道结构的氮掺杂多孔碳样品（CPH-0，CPH-0.5，CPH-1）。通过扫描电镜、透射电镜表征、N₂吸-脱附等温线测试及元素分析，获得多孔碳孔道结构发展、N含量与KOH活化强度的关系。通过CO₂吸附测试分析可知，多孔碳的CO₂吸附量在低压（<15 kPa）时受N含量影响，在常压（100 kPa）下由超微孔（<1 nm）孔体积决定。样品CPH-0的N含量最多，在低压范围表现出优异的CO₂吸附能力。样品CPH-0.5的超微孔孔体积最大，在25 °C，100 kPa条件下，对CO₂的吸附量可达3.97 mmol/g，同时还表现出较好的CO₂/N₂选择性和优异的循环稳定性。该法制备的多孔碳在CO₂吸附和CO₂/N₂分离方面具有广阔的应用前景。

关键词:玉米秸秆;多孔碳;水热碳化;KOH活化;CO吸附;CO/N分离

doi:10.16186/j.cnki.1673-9787.2020090060

基金项目:国家自然科学基金资助项目（U1804156）；中国博士后科学基金面上项目（2018M632775）；河南省高等学校重点科研项目（18A620002，18A150005）；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开放课题（WS2018A05）

收稿日期:2020/09/14

修回日期:2021/01/07

出版日期:2022/11/25

Preparation of stalk-based nitrogen-doped porous carbon and its CO₂ adsorption and CO₂/N₂ separation properties

ZHANG Tao1, WANG Binbin1, LI Yao2,3

1.School of Materials Science and Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China；2.School of Safety Science and Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China；3.Key Laboratory of Gas Geology and Gas Control of Henan Province，Jiaozuo 454000，Henan，China

Abstract:In order to address the increasing amount of CO₂ in the atmosphere，adopting corn stalks as raw，a series of nitrogen-doped porous carbon samples（CPH-0，CPH-0.5 and CPH-1）with well-developed porous structure were prepared by hydrothermal carbonization and KOH activation treatment with the control of KOH activation intensity.According to characterization of scanning electron microscopy（SEM）and transmission electron microscopy（TEM），N₂ adsorption-desorption isotherm test and elemental analysis，the relationship between porous structure development content and KOH activation intensity could be obtained.By analyzing CO₂ adsorption test，it could be known that under low pressure（<15 kPa），the CO₂ adsorption capacity was mainly influenced by N content，while under ambient pressure （100 kPa），the CO₂ adsorption capacity was determined by ultra-micropore（<100 kPa）volume.Sample CPH-0 had the highest content and showed excellent CO₂ adsorption capacity at low pressure range.Sample CPH-0.5 had the largest ultra-micropore volume，and showed a CO₂ adsorption capacity as high as 3.97 mmol/g under the 25 °C and 100 kPa，as well as good CO₂/N₂ selectivity and excellent cycling stability.The porous carbon prepared by this method had a broad application prospect in CO₂ adsorption and CO₂/N₂ separation.

Key words:corn stalk;porous carbon;hydrothermal carbonization;KOH activation;CO adsorption;CO/N separation

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