改性蜂窝状活性炭吸附二氧化碳和氮气的热力学  

Thermodynamic study of CO_2 and N_2 adsorption on modified activated carbon monolith

作　　者：陈建宇[1] 刘资文[1] 李平[1] 于建国[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《化工学报》2012年第10期3017-3026,共10页CIESC Journal

基　　金：国家高技术研究发展计划项目(2008AA062302);上海市浦江人才项目(08PJ14034);上海市国际合作项目(08160704000)~~

摘　　要：蜂窝状活性炭具有较高的比表面积、多孔道、压降低、吸脱附速率快、不易堵塞等优点,因此被认为是捕集烟道气中CO2重要吸附材料。选用蜂窝状煤基和椰壳两种活性炭吸附剂,采用磁悬浮热天平分别测定了CO2和N2的吸附等温线。采用1mol.L-1 K2CO3对蜂窝状活性炭材料进行浸渍改性,提高在低二氧化碳分压下的CO2吸附性能。采用Langmuir、multi-site Langmuir和Virial 3种模型对吸附平衡数据进行拟合,得出热力学参数,为后续吸附工艺优化设计提供基础数据。结果表明在实验范围内3种模型均能对实验测量的等温线进行较好的拟合,Langmuir模型总体拟合效果最好。Activated carbon（AC）monolith has the advantages of higher specific surface area,multi channels of pores,higher adsorption and desorption rates and lower pressure drop.So it is generally considered as a promising adsorbent material to capture CO2.In this paper,two commercial coal/coconut AC monoliths were used as adsorbents to capture CO2 from flue gas.These adsorbent materials were soaked in K2CO3 solution to improve CO2 adsorption capacity and selectivity of CO2/N2.Adsorption equilibrium isotherms of CO2 and N2 on coal/coconut AC monoliths（before/after soaking in K2CO3 solution）were measured by using magnetic suspension balance.The experimental data were fitted with Langmuir,multi-site Langmuir and Virial models,respectively.Three models fitted well with the measured isotherms in the whole experimental range,and Langmuir model was the best one.

关 键 词：蜂窝状活性炭 CO2吸附 表面改性 吸附等温线 CO2捕集 

分 类 号：TQ021[化学工程]