摘要
面向降低碳捕集技术成本的重大需求,针对高性能吸附剂开发这一关键问题,以廉价的苯为原料,基于Friedel-Crafts烷基化反应,以二甲醇缩甲醛为交联剂合成了聚合物材料,将其作为前体制备了一种新的碳载钾基CO_(2)吸附剂。通过固体核磁、红外光谱、电子显微镜、X射线粉末衍射、N_(2)物理吸附等表征手段,发现所合成的聚合物前体具有超交联多孔结构,通过表面氧化改性的方法可实现多种含氧官能团的修饰,这些含氧官能团具有锚定钾离子的作用,因此可通过离子交换的方式实现表面的钾改性。经过进一步的高温炭化后,可获取全新的碳载钾基CO_(2)吸附剂。该类吸附剂上的含钾位点具有较好的分散性,能够与CO_(2)发生可逆化学反应,其在模拟烟气下的CO_(2)吸附量达到了1.63mmol/g,且循环稳定性良好,具有一定的应用潜力。
In view of the significant demand for reducing the cost of carbon capture and the key problem of developing high-performance adsorbents,a new carbon supported potassium-based CO_(2) adsorbent was prepared from a polymer precursor derived from Friedel Crafts alkylation between benzene and dimethyl acetal.By means of solid nuclear magnetic resonance,infrared spectroscopy,electron microscopy,X-ray powder diffraction,N_(2) physical adsorption and other characterization methods,it was found that the synthesized polymer precursor had a hyper-crosslinked porous structure,and the modification of a variety of oxygen-containing functional groups could be achieved by surface oxidation modification.These oxygen-containing functional groups had the function of anchoring potassium ions,and thus the surface potassium modification can be achieved by ion exchange.After further high-temperature carbonization,a new carbon supported potassium-based CO_(2) adsorbent can be obtained.The potassium sites on the adsorbent had good dispersibility and could react reversibly with CO_(2).The CO_(2) adsorption capacity of the adsorbent under the simulated flue gas reached 1.63mmol/g with good cyclic stability,which endowed the adsorbent with promising application potential.
作者
陈崇明
曾四鸣
罗小娜
宋国升
韩忠阁
郁金星
孙楠楠
CHEN Chongming;ZENG Siming;LUO Xiaona;SONG Guosheng;HAN Zhongge;YU Jinxing;SUN Nannan(State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,Hebei,China;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China;State Grid Hebei Energy Technology Service Co.,Ltd.,Shijiazhuang 050021,Hebei,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2023年第3期1540-1550,共11页
Chemical Industry and Engineering Progress
基金
国网河北能源技术服务有限公司自主项目(TSS2021-06)。
关键词
二氧化碳
捕集
碳材料
减排
碳中和
carbon dioxide
capture
carbon materials
emission reduction
carbon neutrality
