模板法多孔炭的制备及CH_4/N_2/CO_2吸附分离  

Preparation of porous carbon via template method and adsorption separation of CH_4/N_2/CO_2

作　　者：余新江[1] 赵元首 

机构地区：[1]克拉玛依职业技术学院石油化学工程系,新疆独山子833600 [2]中国石油大学(华东)化学工程学院,山东青岛266580

出　　处：《石油化工》2016年第2期221-226,共6页Petrochemical Technology

摘　　要：以糠醇为碳源,模板法两次浸渍制备多孔炭,采用XRD、SEM、FTIR、N_2吸附-脱附等方法对其进行表征,利用磁悬浮天平测量了CH_4,N_2,CO_2的吸附等温线,并对吸附等温数据进行Langmuir拟合,由Henry常数预测多孔炭对混合体系的平衡选择性。表征结果显示,多孔炭孔分布较窄,具有丰富的孔结构,在一定程度上复制了分子筛的孔道结构,且表面呈现一定的极性,有利于CH_4,N_2,CO_2的吸附和分离。实验结果表明,CH_4,N_2,CO_2的平衡吸附量大小的顺序为:CO_2>CH_4>N_2,Langmuir模型拟合相关系数均大于0.993,拟合效果较好,可用Langmuir理论解释气体在多孔炭孔结构及表面的吸附行为,制备的多孔炭适用于烟道气中CO_2的吸附与分离及煤层气等非常规天然气的提纯,但对垃圾填埋气的分离效果不显著。Porous carbon was prepared from furfuryl alcohol by template method with double- impregnation and was characterized by means of XRD, SEM, FTIR and N2 adsorption-desorption. The adsorption equilibrium isotherms of CH4, N2 and CO2 on the porous carbon were measured by means of magnetic suspension balance. The Langmuir model was used to fit the adsorption isotherm data and the equilibrium selectivities of the mixed gas were predicted by the Henry constants. The characterization results showed that the pore size distribution of the porous carbon was narrow and it kept the regular structure of zeolite to some extent with surface polarity, which was beneficial to the adsorption and separation of CH4, N2, CO2. The order of their equilibrium adsorption capacity on the porous carbon is CO2〉CH4〉N2. All the correlation coefficients for the Langmuir model are greater than 0.993. The porous carbon is suitable for the adsorption and separation of CO2 in flue gases and the purification of unconventional gas namely coalbed methane, but its separation effect for landfill gas is not significant.

关 键 词：模板法 多孔炭 CH4/N2/CO2吸附分离 Langmuir拟合 平衡选择性 

分 类 号：TQ424.1[化学工程]