Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Effects of Alkaline Additives on CO2 Removal by Li2ZrO3

Li2ZrO3로 CO2 제거시 알칼리 첨가제 효과

  • Park, Joo-Won (Department of Chemical Eng., Kwangwoon University) ;
  • Kang, Dong-Hwan (Department of Chemical Eng., Kwangwoon University) ;
  • Jo, Young-Do (Department of Chemical Eng., Kwangwoon University) ;
  • Yoo, Kyung-Seun (Department of Environmental Eng., Kwangwoon University) ;
  • Lee, Jae-Goo (Thermal Process Research Center, Korea Institute of Energy Research) ;
  • Kim, Jae-Ho (Thermal Process Research Center, Korea Institute of Energy Research) ;
  • Han, Choon (Department of Chemical Eng., Kwangwoon University)
  • 박주원 (광운대학교 화학공학과) ;
  • 강동환 (광운대학교 화학공학과) ;
  • 조영도 (광운대학교 화학공학과) ;
  • 유경선 (광운대학교 환경공학과) ;
  • 이재구 (한국에너지기술연구원 열공정연구센터) ;
  • 김재호 (한국에너지기술연구원 열공정연구센터) ;
  • 한춘 (광운대학교 화학공학과)
  • Received : 2005.09.20
  • Accepted : 2006.04.19
  • Published : 2006.10.31
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Abstract

Effects of alkaline additives on the $CO_2$ removal reaction have been investigated by a thermogravimetric analyzer. $Li_2ZrO_3$ was synthesized by soild reaction of $ZrO_2$ with $Li_2CO_3$ and then alkali chemicals were added to the synthesized $Li_2ZrO_3$ and then heat treatment was carried out. Addition of alkali chemicals enhanced the reactivity of $Li_2ZrO_3$ with the following order; $K_2CO_3>NaCl>LiCl>Na_2CO_3$, which were resulted from the formation of partially melted $Li_2CO_3$. SEM photographs showed the presence of melted state and the XRD results showed that the chemical states of added salts were not changed. Addition of NaCl caused the induction time of about 60 min at the initial reaction stage and the addition of $Na_2CO_3$ inhibited the decomposition of $Li_2CO_3$ at about $700{\sim}750^{\circ}C$.

가연성 폐기물 가스화반응으로 생성되는 합성가스내의 $CO_2$ 제거반응에서 $Li_2ZrO_3$와 알칼리염 첨가제의 효과를 열중량 분석기를 이용하여 그 특성을 연구하였다. $Li_2ZrO_3$는 고체상태의 $ZrO_2$와 $Li_2CO_3$를 합성하여 제조하였고, 반응성향상을 위하여 $K_2CO_3$, $Na_2CO_3$, NaCl, LiCl 등의 알칼리염을 첨가한 후 열처리하여 사용하였다. 첨가한 알칼리염에 따른 반응성 향상은 $K_2CO_3>NaCl>LiCl>Na_2CO_3$ 순으로 나타났고 이는 $Li_2CO_3$의 partial melting에 기인한 것으로 사료된다. 반응 시료의 SEM 분석 결과 용융상태의 존재를 확인할 수 있었고, XRD를 통해 첨가된 알칼리염들의 화학적 성분 변화는 일어나지 않는 것으로 확인되었다. NaCl을 사용한 경우 반응 초기에 60분 정도의 유도시간이 발생하였으며, $Na_2CO_3$가 첨가된 경우 $700{\sim}750^{\circ}C$에서도 $Li_2ZrO_3$의 $CO_2$ 제거반응에 의해 생성된 $Li_2CO_3$의 분해가 유도되지 않아 반응성 감소현상이 나타나지 않았다.

Keywords

Acknowledgement

Supported by : 광운대학교

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