Adsorption Characteristics of Chemically Modified Sorbents for Carbon Dioxide

화학처리된 흡착제의 이산화탄소 흡착 특성에 관한 연구

  • Lee, Kyung-Mi (College of Environment & Applied Chemistry, Center for Environmental Sutudies, Kyunghee University) ;
  • Jo, Young-Min (College of Environment & Applied Chemistry, Center for Environmental Sutudies, Kyunghee University)
  • 이경미 (경희대학교 환경응용화학대학, 환경연구센터) ;
  • 조영민 (경희대학교 환경응용화학대학, 환경연구센터)
  • Received : 2008.07.29
  • Accepted : 2008.09.22
  • Published : 2008.10.10

Abstract

In order to enhance the adsorption capacity of $CO_2$, a commercial zeolite and coal fly ash were chemically modified with alkali cations (Li, K) and alkaline-earth cations (Ca, Mg). Adsorbents containing Ca and Mg showed slightly lower surface areas. The adsorption capacity at the ambient temperature was highest with Ca, then in order of Mg, Li, and K. On the contrary, regeneration efficiency of the adsorbents with Ca and Mg was relatively low, because Ca and Mg cations had stronger affinity of carbon dioxide. The affinity between cations and $CO_2$ molecule also may improve the selectivity in favor of $CO_2$ adsorption.

Keywords

carbon dioxide;zeolite;fly ash;adsorption;alkali cation

Acknowledgement

Supported by : 지식경제부

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