Korean Chemical Engineering Research

  • 제60권4호
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  • Pages.606-612
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  • 2022
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  • 0304-128X(pISSN)
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  • 2233-9558(eISSN)
한국화학공학회 (The Korean Institute of Chemical Engineers)
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K계열 함침 탄소계 흡착제의 실내 저농도 이산화탄소 흡착성능 강화

Development of Potassium Impregnated Carbon Absorbents for Indoor CO2 Adsorption

  • 정세은 (한국에너지기술연구원 온실가스연구단) ;
  • ;
  • 이유리 (한국에너지기술연구원 온실가스연구단) ;
  • 원유섭 (한국에너지기술연구원 온실가스연구단) ;
  • 김재영 (한국에너지기술연구원 온실가스연구단) ;
  • 장재준 (한국에너지기술연구원 온실가스연구단) ;
  • 김하나 (한국에너지기술연구원 온실가스연구단) ;
  • 조성호 (한국에너지기술연구원 온실가스연구단) ;
  • 박영철 (한국에너지기술연구원 온실가스연구단) ;
  • 남형석 (북대학교 기계공학부)
  • Jeong, Se-Eun (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Wang, Shuang (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Lee, Yu-Ri (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Won, Yooseob (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Kim, Jae-Young (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Jang, Jae Jun (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Kim, Hana (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Jo, Sung-ho (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Park, Young Cheol (Greenhouse Gas Laboratory, Korea Institute of Energy Research) ;
  • Nam, Hyungseok (School of Mechanical Engineering, Kyungpook National University)
  • 투고 : 2022.04.29
  • 심사 : 2022.06.27
  • 발행 : 2022.11.01
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초록

실내 거주 시간이 늘어나면서 발생하는 CO2를 인체에 무해한 농도인 1,000 ppmCO2 이하로 유지하기 위해 연구들이 활발히 진행 중이다. 본 연구에서는 저농도 CO2흡착제로서 KOH와 K2CO3와 같은 알칼리성 첨가제를 상용 활성탄에 함침하여 사용하였다. 흡착된 CO2 양은열중량분석기(TGA)와 chamber(CO2 IR analyzer)로평가하였다. 비표면적이 928.5 m2/g인 상용 활성탄(AC)은 KOH가 함침 된 KOH/AC(13.6 m2/g)와 K2CO3가 함침 된 K2CO3/AC(288.8 m2/g)보다 비표면적이 높았다. 챔버실험결과, AC는 CO2를 거의 흡착하지 않았지만, KOH/AC와 K2CO3/AC는 각각 93.5 mgCO2/gsample 및 94.5 mgCO2/gsample 흡착하였다. 이것은 비표면적 및 미세기공의 부피에 의한 물리적인 흡착 영향보다 알칼리성 활성점의 증가가 CO2 흡착에 더 유리하게 작용한 것으로 판단된다. KOH/AC와 K2CO3/AC의 재생성능은 chamber test 결과 대조군(K2CO3/Al+Si supports)과 비교했을 때 안정적으로 흡착 성능을 유지하는 것으로 나타났다(3회 반복 실험). 또한, KOH/AC와 K2CO3/AC는열중량분석기의절대습도 1%H2O를고려한조건에서 145.7 mgCO2/gsample및 150 mgCO2/gsample로 나타났다. 따라서 KOH 및 K2CO3 등과 같은 알칼리 성분의 함침은 상용 활성탄의 안정적인 흡착 및 재생 후 흡착성능을 나타내어, 실내 이산화탄소 저감을 위한 흡착제 개발에 적용될 수 있을 것으로 판단된다.

Relatively high indoor CO2 concentration (>1,000 ppm) has a negative impact on human health. In this work, indoor CO2 adsorbent was developed by impregnating KOH or K2CO3 on commercial activated carbon, named as KOH/AC and K2CO3/AC. Commercial activated carbon (AC) showed relatively high BET surface area (929 m2/g) whereas KOH/AC and K2CO3/AC presented lower BET surface area of 13.6 m2/g and 289 m2/g. Two experimental methods of TGA (2,000 ppmCO2, weight basis) and chamber test (initial concentration: 2,000 ppmCO2, CO2 IR analyzer) were used to investigate the adsorption capacity. KOH/AC and K2CO3/AC exhibited similar adsorption capacities (145~150 mgCO2/g), higher than K2CO3/Al+Si supports adsorbent (84.1 mgCO2/gsample). Similarly, chamber test also showed similar trend. Both KOH/AC and K2CO3/AC represented higher adsorption capacities (KOH/AC: 93.5 mgCO2/g K2CO3/AC: 94.5 mgCO2/gsample) K2CO3/Al+Si supports. This is due to the KOH or K2CO3 impregnation increased alkaline active sites (chemical adsorption), which is beneficial for CO2 adsorption. In addition, the regeneration test results showed both K-based adsorbents pose a good regeneration and reusability. Finally, the current study suggested that both KOH/AC and K2CO3/AC have a great potential to be used as CO2 adsorbent for indoor CO2 adsorption.

키워드

과제정보

본 연구는 한국에너지기술연구원 주요사업(C2-2440-01)을 재원으로 수행한 연구결과입니다.

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