葡萄糖基多孔碳材料对CO_2/CH_4的分离性能  

Separation performance of CO_2/CH_4 on porous carbons derived from glucose

作　　者：王丽[1] 王兴杰[1] 李浩[1] 陈永伟 李忠[1,2] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640 [2]亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《化工学报》2018年第2期733-740,共8页CIESC Journal

基　　金：广东省省级科技计划项目(2016A020221006)~~

摘　　要：以淀粉糖(主要成分为葡萄糖)为碳前体,制备了一系列多孔碳材料(C-GLCs-800),对其进行孔隙结构分析,并应用FT-IR、SEM、TGA对其进行了表征,测定了材料在288、298和308 K下的CO_2和CH_4吸附等温线,根据IAST理论预测了材料对CO_2/CH_4二元体系的吸附选择性。实验结果显示,活化条件对材料的孔隙结构有明显影响,随着KOH/C质量比的增加,所制备的C-GLCs-800比表面积和总孔容先增加后降低。其中C-GLC-800-4的BET比表面积高达3153 m2·g^(-1),总孔容为2.056 cm3·g^(-1)。C-GLC-800-2的窄微孔(Vd<1 nm,孔容0.3538 cm3·g^(-1))含量最高,为30.63%。C-GLC-800-2在298 K和105 Pa下对CO_2吸附量高达3.96 mmol·g^(-1),明显高于许多传统吸附材料和MOFs材料在相同条件下对CO_2的吸附容量。应用Clausiuse-Clapeyron方程计算了CO_2和CH_4在材料上的吸附热,应用IAST理论计算了CO_2/CH_4的吸附选择性,结果显示C-GLC-800-2对CO_2/CH_4的吸附选择性为8.35。A series of glucose-based porous carbons（C-GLCs-800） were developed by simple carbonization and KOH activation, and characterized by scanning emission microscopy（SEM）, nitrogen sorption, Fourier transformed infrared（FI-TR） and thermogravimetric analysis（TGA）. Pure component adsorption isotherms of CO2 and CH4 were measured separately at 288, 298, and 308 K. The ideal adsorbed solution theory（IAST） model was used to estimate adsorption selectivity of the samples for CO2/CH4 binary mixtures. Results showed that the specific surface area and total pore volume of C-GLCs-800 increased at first and then decreased with the ratio of KOH/C at which the samples were activated. The BET surface area and total pore volume of C-GLC-800-4 reached as high as 3153 m2·g^（-1） of 2.056 cm3·g^（-1）, respectively. The narrow micropores voulme of C-GLC-800-2 reached as high as 0.3538 cm^3·g^-1. The C-GLC-800-2 exhibited an extraordinary CO2 adsorption capacity of 3.96 mmol·g^-1 at 298 K under 105 Pa, which was comparable to many traditional adsorbents and MOFs. The isosteric heats of CO2 adsorption on C-GLC-800-2 was higher than that of CH4. The IAST-predicted CO2/CH4 selectivity was about 8.35.

关 键 词：葡萄糖 水热碳化 多孔碳 二氧化碳 甲烷 吸附 选择性 

分 类 号：O647.3[理学—物理化学]