Study on CO₂ Adsorption on LiOH-Modified Al₂O₃

Abstract:

LiOH is known to be one of the most efficient CO₂ adsorbent because it reacts with CO₂ to form Li₂CO₃. However, LiOH still suffers from lack of enough hardness for practical use. In this study, various substrates, were modified with LiOH. Their X-ray diffraction patterns were investigated, and LiOH peak was observed from all prepared samples. CO₂ adsorption capacity of each prepared sample was measured by monitoring CO₂ concentration change during the adsorption process under constant CO₂ gas inflow condition. LiOH-modified Al₂O₃ and zeolite 5A showed good CO₂ adsorption performance, while LiOH-modified AC and SiO₂ showed relatively poor CO₂ adsorption. Al₂O₃ and zeolite 5A contains many basic functional groups of Al3+, which promote the neutralization reaction with acidic CO₂. The effect of carrier gas, carrier gas flow rate, initial CO₂ concentration, and amount of LiOH-modified Al₂O₃ loading was investigated. CO2 adsorption performance was better when the carrier gas was N₂, because O₂ competes with CO₂ on LiOH. CO₂ adsorption performance was better with lower carrier gas flow rate, lower initial CO₂ concentration, and less loading of adsorbent due to the increase of contact time and contact points.

• Periodical: Applied Mechanics and Materials (Volumes 284-287)
• Pages: 342-346
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.284-287.342
• Online since: January 2013
• Authors: Young Min Cho, Young Min Yang, Duck Shin Park, Soon Bark Kwon, Woo Sung Jung, Ju Yeol Lee
• Keywords: Adsorption, Al₂O₃, CO₂, Greenhouse Gas (GHG), LiOH

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