富氮官能团活性炭的制备及其吸附CO_(2)性能研究  

Synthezis of Nitrogen-rich Functional Group Active Carbon and Its Adsorption Properties for CO_(2)

作　　者：徐迎节 张婧[2,3] 王冬冬 李爽[2,3] 魏英华 史翊翔[2,3] 蔡宁生 XU Yingjie;ZHANG Jing;WANG Dongdong;LI Shuang;WEI Yinghua;SHI Yixiang;CAI Ningsheng(Coal Preparation Center of Ningxia Coal Co.,Ltd.,China National Energy Group,Shizuishan 753000,China;Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Shanxi Research Institute for Clean Energy,Tsinghua University,Taiyuan 030032,China)

机构地区：[1]国家能源集团宁夏煤业有限责任公司洗选中心,石嘴山753000 [2]清华大学能源与动力工程系,热科学与动力工程教育部重点实验室,北京100084 [3]清华大学山西清洁能源研究院,太原030032

出　　处：《工程热物理学报》2023年第5期1405-1412,共8页Journal of Engineering Thermophysics

基　　金：国家能源集团宁夏煤业有限责任公司科技创新项目(No.NXMY-18-19);国家自然科学基金(No.52176190;No.51806120);清华大学山西清洁能源研究院科研团队经费资助项目(No.sxky1903)。

摘　　要：本研究以煤基活性炭产品为原料,尿素作为氮源,通过浸渍、高温活化的方法进行改性,开发了一款可用于煤制氢/重整制氢中温变换气中CO_(2)脱除的煤基富氮活性炭,并对其进行结构及性能表征。其中性能最优样品U-80C-N-550,其表面氮含量为9.92%,N/O比1.22,水接触角为137.92°±1.24°。在测试条件为99.99%CO_(2)气氛,200℃温度,1 MPa压力下,CO_(2)吸附容量可以达到1.27 mmol/g,且在进行40次吸附解吸循环过程中CO_(2)吸附量基本保持不变,循环稳定性好。结果表明,不同条件下制备的富氮活性炭样品表面含氮基团含量及种类不同,因此通过改变吸附剂制备工艺条件,可适当调控活性炭表面含氮基团的种类及含量,从而提高其CO_(2)吸附性能的同时增强其疏水性,得到了适合于含水蒸气富氢气体中脱除CO_(2)的吸附剂。In this study,a coal-based nitrogen-rich activated carbon that can be used for CO_(2) removal from elevated temperature shift gas of hydrogen production from coal/steam reforming was developed using coal-based activated carbon products as raw materials,urea as nitrogen source,and modified by impregnation and high-temperature activation methods,and its structure and performance were characterized.Among them,the best performance sample was U-80C-N-550,which surface nitrogen content is 9.92%,N/O ratio is 1.22,and water contact angle is 137.92°±1.24°.The adsorption capacity of CO_(2) reached 1.27 mmol/g and good cyclic stability that CO_(2) capacity basically remains unchanged during 40 cycles of adsorption and desorption were obtained under 99.99% CO_(2) atmosphere,200℃ temperature and 1 MPa pressure working condition.Results showed that nitrogen content of nitrogen molecules and types on the surface of activated carbon samples were different,varying from different preparation conditions.Therefore,CO_(2) adsorption performance and its hydrophobicity would be enhanced by maneuver of preparation processes and appropriately controlling the types of activated carbon surface nitrogen molecules and content,in order to synthesis CO_(2) adsorbents that are suitable for CO_(2) removal from industrial hydrogen-rich gas mixture containing vapor.

关 键 词：活性炭 含氮官能团 疏水性 二氧化碳吸附 

分 类 号：TK16[动力工程及工程热物理—热能工程]