Journal
CATALYSIS TODAY
Volume 359, Issue -, Pages 83-89Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2019.06.056
Keywords
CO2 adsorbent; Lithium hydroxide; Electrochemical lithium recovery; Electrodialysis
Funding
- Korea Ministry of Environment as Global top project [2016002110008]
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An electrochemical system was proposed for selective recovery of LiOH from used CO2 adsorbents, allowing for one-step production of LiOH solution. Experimental and theoretical investigations were carried out to discuss the electrochemical behaviors of the system, including strategies to maximize energy efficiency.
In recent years, there have been growing interest in indoor air quality, and large efforts have been devoted to controlling the concentration of CO2 below a certain level. Lithium hydroxide (LiOH) is the most widely used material for CO2 capture due to its large adsorption capacity and fast kinetics; however, steep increase in the cost of lithium is endangering the economic feasibility of CO2 adsorbents comprised of LiOH. In order to resolve this problem, we herein propose an electrochemical system for selective recovery of LiOH from used CO2 adsorbents. Electrocatalytic water splitting electrodes separated by a cation exchange membrane enable selective migration of lithium ions from the oxygen-evolving feed chamber to hydrogen-evolving recovery chamber, and this leads to one-step production of LiOH solution. Electrochemical behaviors of the system, including the time-dependent quantities of the active chemical species during the operation, are discussed by experimental and theoretical investigations, and the strategy to maximize the energy efficiency of our system is suggested.
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