改性蜂窝状活性炭吸附二氧化碳和氮气的热力学

doi:10.3969/j.issn.0438-1157.2012.10.002

化工学报 ›› 2012, Vol. 63 ›› Issue (10): 3017-3026.DOI: 10.3969/j.issn.0438-1157.2012.10.002

改性蜂窝状活性炭吸附二氧化碳和氮气的热力学

陈建宇, 刘资文, 李平, 于建国

华东理工大学化学工程联合国家重点实验室, 上海 200237

收稿日期:2012-02-24 修回日期:2012-07-20 出版日期:2012-10-05 发布日期:2012-10-05
通讯作者: 李平
作者简介:李平,陈建宇(1986- ),男,硕士研究生。
基金资助:
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)。

Thermodynamic study of CO₂ and N₂ adsorption on modified activated carbon monolith

CHEN Jianyu, LIU Ziwen, LI Ping, YU Jianguo

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2012-02-24 Revised:2012-07-20 Online:2012-10-05 Published:2012-10-05
Supported by:
supported by the High-tech Research and Development Program of China(2008AA062302),Shanghai Pujiang Talent Program(08PJ14034)and Shanghai International Cooperation Project(08160704000).

摘要/Abstract

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1 mol·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。

关键词: 蜂窝状活性炭, CO₂吸附, 表面改性, 吸附等温线, CO₂捕集

Abstract: 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.

Key words: activated carbon monolith, carbon dioxide adsorption, surface modification, adsorption isotherms, carbon dioxide capture

中图分类号:

TQ021

陈建宇, 刘资文, 李平, 于建国. 改性蜂窝状活性炭吸附二氧化碳和氮气的热力学[J]. 化工学报, 2012, 63(10): 3017-3026.

CHEN Jianyu, LIU Ziwen, LI Ping, YU Jianguo. Thermodynamic study of CO₂ and N₂ adsorption on modified activated carbon monolith[J]. CIESC Journal, 2012, 63(10): 3017-3026.

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改性蜂窝状活性炭吸附二氧化碳和氮气的热力学

Thermodynamic study of CO₂ and N₂ adsorption on modified activated carbon monolith

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改性蜂窝状活性炭吸附二氧化碳和氮气的热力学

Thermodynamic study of CO2 and N2 adsorption on modified activated carbon monolith

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Thermodynamic study of CO₂ and N₂ adsorption on modified activated carbon monolith