Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Synthesis of CO2 Adsorbent with Various Aminosilanes and its CO2 Adsorption Behavior

다양한 아미노실란을 이용한 이산화탄소 흡착제 합성 및 흡착 특성

  • Jeon, Jae Wan (Department of Chemical Engineering, Kongju National University) ;
  • Ko, Young Soo (Department of Chemical Engineering, Kongju National University)
  • Received : 2015.12.24
  • Accepted : 2015.12.30
  • Published : 2016.02.10
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Abstract

The carbon dioxide adsorption behavior of silica with a large specific surface area and pore volume functionalized with aminosilane compounds via in-situ polymerization and functionalization method were investigated. The organosilanes include amino functional group capable of adsorbing carbon dioxide. Elemental analyzer, in situ FT-IR and thermogravimetric analyzer were used to characterize the sorbents and to determine their $CO_2$ adsorption behavior. Comparison of different aminosilane loading in the support revealed that polyaminosilane functionalization of 70% of the pore volume in the support was better in terms of the adsorption capacity and amine efficiency than that of 100% of the pore volume of the support. Furthermore, the sorbents showed a higher adsorption capacity at an adsorption temperature of $75^{\circ}C$ than at $30^{\circ}C$ due to the thermal expansion of synthesized polyaminosilanes inside the pore of silica. The N-[3-(trimethoxysilyl)propyl]ethylenediamine (2NS) sorbent with 70% of the pore volume functionalized showed the highest adsorption capacity of 9.2 wt% at $75^{\circ}C$.

넓은 비표면적과 큰 기공 부피를 갖는 실리카에 다양한 아미노실란 화합물을 in-situ 중합법을 통해 기능화 후 이산화탄소 흡착 특성을 확인하였다. 이산화탄소 흡착 기능기로 아민기가 포함된 아미노실란 화합물이 사용되었다. 흡착제의 흡착 특성 분석을 위해 질소 흡 탈착 실험과 원소분석, in situ FT-IR, TGA를 이용하였다. 흡착제 합성 전후를 비교하였을 때 폴리아미노실란이 기능화되면 표면적과 기공부피 및 크기가 감소하였으며 실리카 기공 부피의 70%에 해당하는 폴리아미노실란 화합물을 기능화 시켰을 경우 기공 부피의 100% 기능화 보다 이산화탄소 흡착능이 향상되었다. 흡착 온도를 비교하며 $30^{\circ}C$보다 $75^{\circ}C$에서 폴리아미노실란 화합물의 열팽창과 자유부피 증가로 흡착능이 증가하였고, 2NS/NPS-2의 경우 기공 부피 70% 기능화와 흡착 온도 $75^{\circ}C$에서 9.2 wt%의 높은 $CO_2$ 흡착능을 보였다.

Keywords

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