Study of CO2 Adsorption Characteristics on Acid Treated and LiOH Impregnated Activated Carbons

산 처리 및 LiOH 첨착 활성탄에서 이산화탄소의 흡착 특성에 대한 연구

  • Han, Jae Uk (Department of Biotechnology and Nanotechnology, Ajou University) ;
  • Kim, Dae Jung (Department of Biotechnology and Nanotechnology, Ajou University) ;
  • Kang, Min (Department of Biotechnology and Nanotechnology, Ajou University) ;
  • Kim, Jin Won (Fuel Cell Research Center, Korea Institute of Science and Technology) ;
  • Kim, Ji Man (Department of Chemistry, Sungkyunkwan University) ;
  • Yie, Jae Eui (Department of Biotechnology and Nanotechnology, Ajou University)
  • 한재욱 (아주대학교 생명분자공학부) ;
  • 김대중 (아주대학교 생명분자공학부) ;
  • 강민 (아주대학교 생명분자공학부) ;
  • 김진원 (한국과학기술연구원 연료전지센터) ;
  • 김지만 (성균관대학교 화학과) ;
  • 이재의 (아주대학교 생명분자공학부)
  • Received : 2004.04.28
  • Accepted : 2005.03.31
  • Published : 2005.06.10

Abstract

Adsorption characteristics of $CO_2$ on activated carbons were evaluated using dynamic adsorption method in a fixed bed with acid treatment, LiOH impregnation and water vapor supply. Physical and chemical properties of the activated carbons were measured using SEM, EDS, nitrogen adsorption, FTIR and XRD. Nitric acid treatment led to the decrease in BET surface area and the increase in oxygen content of virgin activated carbon, and it produced a new functional group that included nitrogen. For the reduction of BET surface area by LiOH impregnation, the nitric acid treated activated carbon (NAC) was less than the virgin activated carbon (AC). Large particles of LiOH were present on the carbon surface when the content of LiOH was over 2 wt%. The adsorbed amount of $CO_2$ on activated carbon in a fixed bed increased with the acid treatment, LiOH impregnation and water vapor supply. The XRD results indicated that LiOH was converted to $Li_2CO_3$ after the adsorption of $CO_2$ on LiOH precursor.

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