Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Adsorption Characteristics of Functionalized Activated Carbon for High Temperature CO2 Capture

고온 이산화탄소 포집을 위한 기능성 활성탄의 흡착특성

  • Choi, Sung-Woo (Department of Environmental Science and Engineering, Keimyung University) ;
  • Lee, Cheol-Gyu (Department of Environmental Science and Engineering, Keimyung University)
  • Received : 2014.11.06
  • Accepted : 2015.03.31
  • Published : 2015.03.31
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Abstract

Activated carbon impregnated with polyethyleneimine (PEI) was evaluated as a functionalized adsorbent for $CO_2$ capture. The $CO_2$ adsorption characteristics of the adsorbents was undertaken using GC/TCD, BET surface area and FT-IR. A series of adsorbents were synthesized by impregnating 10, 30, 50 wt% of PEI on activated carbons and were investigated $CO_2$ adsorption capacity at high and low adsorption temperature. The $CO_2$ adsorption capacity at $20^{\circ}C$ and $100^{\circ}C$ was as follow: AC > PEI(10)-AC > PEI(30)-AC > PEI(50)-AC at $20^{\circ}C$ and PEI(10)-AC > PEI(30)-AC > PEI(50)-AC > AC at $100^{\circ}C$. Adsorption capacities of amine functionalized AC was lager than virgin AC at high temperature due to chemisorption by amino-group content. From the results, the PEI(10)-AC showed one of the most promising adsorbents for $CO_2$ capture from flue gas at high temperature.

이산화탄소 포집을 위한 기능성 흡착제인 폴리에틸렌이민(PEI)을 함침한 활성탄을 평가하였다. 이산화탄소 흡착제의 흡착 특성은 GC/TCD, BET 표면적 및 FT-IR을 사용하였다. 활성탄에 PEI를 10, 30, 50 wt%를 함침하여 흡착제를 합성하고, 온도변화에 따른 이산화탄소의 흡착능을 조사하였다. $20^{\circ}C$와 $100^{\circ}C$에서의 이산화탄소 흡착능은 다음과 같다: $20^{\circ}C$에서는 AC > PEI(10)-AC > PEI(30)-AC > PEI(50)-AC의 순으로 나타났으며, $100^{\circ}C$에서는 PEI(10)-AC > PEI(30)-AC > PEI(50)-AC > AC 순으로 나타났다. 아민 기능기의 활성탄의 흡착능이 순수 활성탄보다 아미노기에 의하여 화학 흡착 때문에 높은 온도에서 높게 나타났다. 본 연구의 결과로 PEI(10) 활성탄은 고온의 가스로부터 이산화탄소 포집에 가장 유능한 흡착제 중 하나로 보여진다.

Keywords

References

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