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Received April 29, 2022
Accepted June 27, 2022
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K계열 함침 탄소계 흡착제의 실내 저농도 이산화탄소 흡착성능 강화
Development of Potassium Impregnated Carbon Absorbents for Indoor CO2 Adsorption
Se-Eun Jeong
Shuang Wang
Yu-Ri Lee
Yooseob Won
Jae-Young Kim
Jae Jun Jang
Hana Kim
Sung-ho Jo
Young Cheol Park
Hyungseok Nam1†
한국에너지기술연구원 온실가스연구단, 34101, 대전 유성구 유성대로 1312번길 140 1경북대학교 기계공학부, 41566, 대구 북구 대학로 80번길
Greenhouse Gas Laboratory, Korea Institute of Energy Research, 140, Yuseong-daero 1312 beon-gil, Yuseong-gu, Daejeon, 34101, Korea 1School of Mechanical Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Korea
namhs219@kier.re.kr
Korean Chemical Engineering Research, November 2022, 60(4), 606-612(7), 10.9713/kcer.2022.60.4.606 Epub 2 November 2022
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Abstract
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 함 침하여 사용하였다. 흡착된 CO2 양은 열중량분석기(TGA)와 chamber(CO2 IR analyzer)로 평가하였다. 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 비 표면적이 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 알칼리 성 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/AC는 열중량분석기의 절대습도 1%H2O를 고려한 조건에서 145.7 mgCO2/gsample 및 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.
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