ZIF-8衍生氮掺杂多孔碳的制备及其对低浓度煤层气中CH4/N2的吸附分离研究

doi:10.11896/cldb.23090093

材料导报

2024, Vol. 38

Issue (24): 23090093-8 https://doi.org/10.11896/cldb.23090093

高分子与聚合物基复合材料

ZIF-8衍生氮掺杂多孔碳的制备及其对低浓度煤层气中CH₄/N₂的吸附分离研究

陈轶思¹, 张宏图¹, 王彬彬², 李瑶^1,*

1 河南理工大学安全科学与工程学院,河南焦作 454003
2 河南理工大学材料科学与工程学院,河南焦作 454003

Research on the Preparation of ZIF-8 Derived Nitrogen-doped Porous Carbon and Its CH₄/N₂ Adsorptive Separation from Low Concentration Coalbed Methane

CHEN Yisi¹, ZHANG Hongtu¹, WANG Binbin², LI Yao^1,*

1 College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2 School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China

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摘要为了充分利用低浓度煤层气,同时减缓全球变暖的趋势,开发一种制备方法简单、性能优异的多孔碳吸附剂,以实现CH₄/N₂混合物中CH₄的有效分离是一项势在必行且具有挑战的工作。本工作以ZIF-8为前驱体和自牺牲模板,成功制备了氮掺杂多孔碳吸附剂,系统分析了碳化温度和碳化时间对所制备碳材料孔隙结构和氮含量的影响,结合CH₄和N₂的等温吸附测试,分析碳材料对CH₄/N₂的吸附分离性能。在碳化温度为1 000 ℃、碳化时间为1 h时,所得的碳材料NPC-1000-1展现出最优的CH₄吸附量(1.52 mmol/g)和CH₄/N₂分离系数,根据亨利定律计算,其对CH₄/N₂的选择性系数为3.73;根据理想溶液吸附理论(IAST),在0.1 MPa压力下,其对二元混合气体CH₄/N₂(30/70)的分离选择性系数为4.72,这主要归因于该样品优异的孔隙结构和理想氮含量的协同作用。本研究为多孔碳吸附剂的制备提供了新思路,同时为煤层气的有效开发利用和环境保护提供了理论支撑。

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关键词: ZIF-8 氮掺杂多孔碳 CH₄/N₂吸附分离

Abstract: In order to make the best use of low concentration coalbed methane (CBM), simultaneously slow down the trend of global warming, it is an imperative and challenging work to develop a porous carbon adsorbent for the realization of effective separation of CH₄ from CH₄/N₂ mixture. Herein, N-doped porous carbon adsorbent has been successfully synthesized by using ZIF-8 as precursor and self-sacrificing template. The effects of carbonization temperature and carbonization time on the porosity structure and nitrogen content of the as-prepared carbon materials have been systematically analyzed. Combined with the testing of isothermal adsorption of CH₄ and N₂, the properties of carbon materials for CH₄/N₂ adsorptive separation have been analyzed. Under the carbonization temperature of 1 000 ℃ and the carbonization time of 1 h, the as-prepared carbon material NPC-1000-1 showed the optimal CH₄ adsorption capacity of 1.52 mmol/g and CH₄/N₂ separation performance. Accor-ding to Henry’s law, the CH₄/N₂ selectivity coefficient was 3.73, while according to the ideal solution adsorption theory (IAST), the selectivity coefficient for binary gas CH₄/N₂ (30/70) was 4.72 under a certain pressure of 0.1 MPa, which was mainly contributed to the synergistic effect of the excellent porosity structure and desirable nitrogen content of the sample. This study provides a new approach for the preparation of porous carbon adsorbents and a theoretical support for the effective development and utilization of coalbed methane and environmental protection.

Key words: ZIF-8 N-doped porous carbon CH₄/N₂ adsorptive separation

出版日期: 2024-12-25 发布日期: 2024-12-20

ZTFLH:

TE991

基金资助: 国家自然科学基金青年基金(42002164);安全学科“双一流”建设学科培育项目(AQ20230707)

通讯作者: * 李瑶,河南理工大学讲师、硕士研究生导师。2005 年毕业于沈阳师范大学获得学士学位,2008 年毕业于东北师范大学获得硕士学位,2016 年毕业于北京理工大学获得博士学位。主要从事多孔碳的设计、合成及煤层气的吸附分离研究。在国际期刊Carbon、Energy、Journal of Environmental Chemical Engineering等发表论文10 余篇,出版专著1 部,授权发明专利3项。 leayao35@hpu.edu.cn

作者简介: 陈轶思,2021 年毕业于河南理工大学获得学士学位,现为河南理工大学安全科学与工程学院硕士研究生,主要研究方向为ZIF-8衍生氮掺杂多孔碳及对CH₄/N₂的吸附分离。

引用本文:

陈轶思, 张宏图, 王彬彬, 李瑶. ZIF-8衍生氮掺杂多孔碳的制备及其对低浓度煤层气中CH₄/N₂的吸附分离研究[J]. 材料导报, 2024, 38(24): 23090093-8.
CHEN Yisi, ZHANG Hongtu, WANG Binbin, LI Yao. Research on the Preparation of ZIF-8 Derived Nitrogen-doped Porous Carbon and Its CH₄/N₂ Adsorptive Separation from Low Concentration Coalbed Methane. Materials Reports, 2024, 38(24): 23090093-8.

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http://www.mater-rep.com/CN/10.11896/cldb.23090093 或 http://www.mater-rep.com/CN/Y2024/V38/I24/23090093

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