多孔蜂窝活性炭材料对CO_(2)吸附热力学研究  

Thermodynamics analysis of CO_(2) adsorption on porous honeycomb activated carbon

作　　者：韦慧 韩志华 孙峤昳 任凯 蒋复国 王保登 马琳鸽 李永龙 Wei Hui;Han Zhi-hua;Sun Qiao-yi;Ren Kai;Jiang Fu-guo;Wang Bao-deng;Ma Lin-ge;Li Yong-long(National Institute of Clean and Low Carbon Energy,Beijing 102209,China)

机构地区：[1]北京低碳清洁能源研究院,北京102209

出　　处：《炭素技术》2023年第1期7-14,共8页Carbon Techniques

基　　金：北京市科委资助项目(Z211100004521009)。

摘　　要：以4种不同品牌多孔蜂窝活性炭为研究对象,采用N2物理吸附、扫描电镜SEM、透射电镜TEM和XRF等方法对活性炭物化结构进行了表征,探讨了不同品牌蜂窝活性炭材料的成分和孔隙结构对CO_(2)吸附的影响。并通过对比0,20,40℃下CO_(2)的吸附等温线,分析CO_(2)在不同蜂窝活性炭材料表面的吸附热力学特性,拟合出CO_(2)气体吸附量与等量吸附热之间的关系。结果表明:N2和CO_(2)吸附等温线属于Ⅰ型吸附等温线,样品主要以微孔结构为主,存在少量介孔结构;不同温度下活性炭吸附CO_(2)曲线均符合Langmuir吸附模型;温度升高,CO_(2)在活性炭材料上的吸附量均减小,说明升温不利于CO_(2)在活性炭上的吸附;相同条件下,泰州800活性炭(TZ800)的吸附量高于淄博800活性炭(ZB800)的吸附量,表明CO_(2)更易吸附于TZ800活性炭上,这可能得益于其丰富和发达的微孔结构。同时TZ800活性炭的等量吸附热稍高于其他3种的等量吸附热,说明CO_(2)分子与TZ800活性炭分子之间作用力较强,计算获得的极限吸附热也显示了同样结果。常州800活性炭(CZ800)在较低CO_(2)浓度环境(15%)中具有较好的CO_(2)吸附性能,重复3次,CO_(2)平均干基吸附量为1.65%。Taking four different brands of honeycomb activated carbon as the research objects, the physical and chemical structure of activated carbon was firstly characterized by N2physical adsorption, scanning electron microscope(SEM),transmission electron microscope(TEM),and XRF. Secondly, the effects of composition and pore structure of different brands of honeycomb activated carbon materials on CO_(2)adsorption were discussed. And then, by comparing the adsorption isotherms of CO_(2)at three temperatures of 0 ℃,20 ℃,and 40 ℃,the thermodynamic characteristics of CO_(2)adsorption on the surface of different honeycomb activated carbon materials were analysed, and the relationship between the amount of CO_(2)gas adsorption and the isosteric heat of adsorption was fitted. The results show that the adsorption isotherms curves of N2and CO_(2)are in line with the type Ⅰ isotherms adsorption, and the samples are mainly composed of microporous structures with a small amount of mesoporous structures. The adsorption curves of CO_(2)on activated carbon at different temperatures are in line with the Langmuir isotherm model. Meanwhile, the adsorption amount of CO_(2)on the activated carbon material decreases with the increase of temperature, indicating that the temperature rise is not conducive to the adsorption of CO_(2)on the activated carbon. Under the same conditions, the adsorption capacity of the activated carbon from Taizhou 800(TZ800) is higher than that of the activated carbon from Zibo 800(ZB800),indicating that CO_(2)is more easily adsorbed on the activated carbon from TZ800,which may be attributed to its rich and well-developed microporous structure. At the same time, the isosteric heat of adsorption of the activated carbon from TZ800 is slightly higher than that of the other three groups, implying that the interaction between CO_(2)molecules and the activated carbon from TZ800 molecules is stronger, and the calculated limit heat of adsorption also shows the same result. The activated carbon from Changzhou 800(CZ8

关 键 词：吸附热力学 CO_(2)吸附 吸附能力 等量吸附热 

分 类 号：TQ424.1[化学工程]