以葡萄糖为原料制备了一系列糖基炭材料(CMS),并将四乙烯五胺(TEPA)负载到炭材料上,得到载胺糖基炭材料(CMS-xTEPA)用于吸附燃煤烟气中的CO₂。研究了TEPA负载量、吸附温度和孔结构对CMS-xTEPA吸附性能的影响,并揭示其吸附机理。结果表明,CMS的CO₂吸附能力主要与其微孔孔径和孔容密切关联,介孔结构丰富、孔容较大的炭材料更适合作载胺载体。CMS-xTEPA的CO₂吸附能力相较于CMS大幅提高,CMS-xTEPA中胺基与CO₂反应生成氨基甲酸酯和氨基甲酸盐类物质,且适宜的吸附温度和TEPA负载量可以提升CMS-xTEPA的CO₂吸附能力。CMS-2-30% TEPA在75℃、15% CO₂+85% N₂气氛下具有较好的CO₂吸附性能和良好的循环CO₂吸附性能,在5次吸附循环后,仍具有3.04 mmol/g的吸附容量。

A series of sugar-based carbon materials (CMS) are prepared from glucose,and then loaded with tetra-ethylenepentamine (TEPA) to obtain amine-loading sugar-based carbon materials (CMS-xTEPA),which are used for the adsorption of CO₂ from coal-fired flue gas.The impacts of TEPA loading amount,adsorption temperature and pore structure on the adsorption performance of CMS-xTEPA are investigated,and the adsorption mechanism is revealed.Results show that the adsorption capacity of CMS to CO₂ has close relation with its microporous pore size and pore volume.Carbon materials with rich mesopore structure and large mesopore volume are more suitable for amine-loading carriers.The adsorption capacity of CMS-xTEPA to CO₂ is much higher than that of CMS.The amine group in CMS-xTEPA reacts with CO₂ to form carbamate and carbamate-like substances,and both the appropriate adsorption temperature and TEPA loading amount can enhance the adsorption capacity of CO₂ by CMS-xTEPA.CMS-2-30% TEPA has good CO₂ adsorption performance,delivering an adsorption capacity of 3.95 mmol·g^-1 at 75℃ and 15% CO₂+85% N₂ atmosphere.In addition,it also presents good cyclic adsorption performance to CO₂,showing an adsorption capacity of 3.04 mmol·g^-1 after five adsorption cycles.

郝晓峰(1996-),男,硕士生,研究方向为煤清洁高效燃烧技术,15835115651@163.com;郑仙荣(1976-),女,博士,副教授,研究方向为煤清洁高效燃烧技术,通讯联系人,zxrty1313@126.com。