Effect of Relative Humidity on Adsorption Breakthrough of CO2 on Activated Carbon Fibers

被引:54
作者
Chiang, Yu-Chun [1 ,2 ]
Chen, Yu-Jen [1 ]
Wu, Cheng-Yen [1 ]
机构
[1] Yuan Ze Univ, Dept Mech Engn, Taoyuan 32003, Taiwan
[2] Yuan Ze Univ, Fuel Cell Ctr, Taoyuan 32003, Taiwan
关键词
relative humidity; carbon dioxide; activated carbon fibers; surface modification; adsorption breakthrough; VACUUM SWING ADSORPTION; WHEELER-JONAS EQUATION; FLUE-GAS; DIOXIDE CAPTURE; RATE COEFFICIENTS; HIGH-PERFORMANCE; SORBENTS; REMOVAL; VAPORS; CURVES;
D O I
10.3390/ma10111296
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Microporous activated carbon fibers (ACFs) were developed for CO2 capture based on potassium hydroxide (KOH) activation and tetraethylenepentamine (TEPA) amination. The material properties of the modified ACFs were characterized using several techniques. The adsorption breakthrough curves of CO2 were measured and the effect of relative humidity in the carrier gas was determined. The KOH activation at high temperature generated additional pore networks and the intercalation of metallic K into the carbon matrix, leading to the production of mesopore and micropore volumes and providing access to the active sites in the micropores. However, this treatment also resulted in the loss of nitrogen functionalities. The TEPA amination has successfully introduced nitrogen functionalities onto the fiber surface, but its long-chain structure blocked parts of the micropores and, thus, made the available surface area and pore volume limited. Introduction of the power of time into the Wheeler equation was required to fit the data well. The relative humidity within the studied range had almost no effects on the breakthrough curves. It was expected that the concentration of CO2 was high enough so that the impact on CO2 adsorption capacity lessened due to increased relative humidity.
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页数:14
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