用于直接空气捕集的钾基吸附剂的掺杂改性  

Doping Modification of Potassium-Based Adsorbents for Direct Air Capture

作　　者：郑健飞 陈晓平[1,2] 马吉亮[1,2] 梁财[1,2] Zheng Jianfei;Chen Xiaoping;Ma Jiliang;Liang Cai(School of Energy and Environment,Southeast University,Nanjing 210096,China;Key Laboratoryof Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源与环境学院,南京210096 [2]东南大学能源热转换及其过程测控教育部重点实验室,南京210096

出　　处：《燃烧科学与技术》2025年第2期197-204,共8页Journal of Combustion Science and Technology

基　　金：江苏省双碳-前沿基础资助项目(BK20220001).

摘　　要：针对再生温度过高以及制备过程复杂的问题,以微米级ZrO_(2)为载体、K_(2)CO_(3)为活性组分,研制了制备过程简易且可以实现低温下直接空气捕集的钾基吸附剂,并选取二氧化钛(TiO_(2))、氯化钾(KCl)、活性炭(AC)、锆硅酸钠(Na_(2)ZrO·(SiO_(4))_(2))、全弗烷基硅烷(C_(10)H_(4)C_(l3)F_(17)Si)作为K_(2)CO_(3)/ZrO_(2)复合吸附剂的掺杂剂进行改性.对5种改性复合吸附剂在CO_(2)直接空气捕集中的碳酸化反应特性进行了研究,结果表明:Na_(2)ZrO·(SiO_(4))_(2)、AC、TiO_(2)的掺杂对K_(2)CO_(3)/ZrO_(2)复合吸附剂的吸附量有负面作用;KCl的掺杂对吸附量的提升作用较小;而C_(10)H_(4)C_(l3)F_(17)Si的掺杂使K_(2)CO_(3)/ZrO_(2)吸附剂的吸附量提升了56%,吸附过程中碳酸化反应速率整体提高,增加了直接空气捕集的经济性.论文进一步通过微观层面阐述了掺杂剂对钾基吸附剂碳酸化反应特性的作用原理.Aiming at high regeneration temperature and complicated preparation process,this paper developed solid adsorbents with easy preparation process and direct air capture at low temperature by using micrometer-sized ZrO_(2) as the support and K_(2)CO_(3) as the active component.TiO_(2),KCl,activated carbon,Na_(2)ZrO·(SiO_(4))_(2),and Perfluoroalkylsilane were selected as dopants for the modification of K_(2)CO_(3)/ZrO_(2)composite potassium-based ad-sorbents.The carbonation reaction properties of the five modified composite adsorbents in the direct air capture of CO_(2) were investigated.The results showed that the doping modification of sodium zirconium silicate,activated carbon,and titanium dioxide had a negative effect on the adsorption amount of the K_(2)CO_(3)/ZrO_(2)composite adsorb-ent;the doping of potassium chloride had a relatively small effect on the enhancement of the adsorption amount;whereas,the doping modification of perfluoroalkylsilanes enhanced the adsorption amount of the K_(2)CO_(3)/ZrO_(2)adsorbent by 56%and increased the overall carbonation reaction rate in the adsorption process,thus enhancing the economy of direct air capture.The paper further analyzed the influence mechanism of the carbonation reaction char-acteristics of potassium-based adsorbents from the microscopic point of view.

关 键 词：复合吸附剂 直接空气捕集 掺杂改性 K_(2)CO_(3)/ZrO_(2) 

分 类 号：X511[环境科学与工程—环境工程]