ZIF-8衍生氮掺杂多孔碳的制备及其对低浓度煤层气中CH_(4)/N_(2)的吸附分离研究  

Research on the Preparation of ZIF-8 Derived Nitrogen-doped Porous Carbon and Its CH_(4)/N_(2)Adsorptive Separation from Low Concentration Coalbed Methane

作　　者：陈轶思 张宏图[1] 王彬彬 李瑶 CHEN Yisi;ZHANG Hongtu;WANG Binbin;LI Yao(College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,Henan,China;School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,Henan,China)

机构地区：[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

出　　处：《材料导报》2024年第24期244-251,共8页Materials Reports

基　　金：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)。

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CH 4/N 2混合物中CH 4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CH 4和N 2的等温吸附测试,分析碳材料对CH_(4)/N_(2)的吸附分离性能。在碳化温度为1000℃、碳化时间为1 h时,所得的碳材料NPC-1000-1展现出最优的CH 4吸附量(1.52 mmol/g)和CH_(4)/N_(2)分离系数,根据亨利定律计算,其对CH_(4)/N_(2)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CH_(4)/N_(2)(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。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 CH_(4)from CH_(4)/N_(2)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 CH_(4)and N_(2),the properties of carbon materials for CH_(4)/N_(2)adsorptive separation have been analyzed.Under the carbonization temperature of 1000℃and the carbonization time of 1 h,the as-prepared carbon material NPC-1000-1 showed the optimal CH_(4)adsorption capacity of 1.52 mmol/g and CH_(4)/N_(2)separation performance.Accor-ding to Henry’s law,the CH_(4)/N_(2)selectivity coefficient was 3.73,while according to the ideal solution adsorption theory(IAST),the selectivity coefficient for binary gas CH_(4)/N_(2)(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.

关 键 词：ZIF-8 氮掺杂 多孔碳 CH_(4)/N_(2)吸附分离 

分 类 号：TE991[石油与天然气工程—石油机械设备]