화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Clean Technology, Vol.16, No.4, 284-291, December, 2010
Export Citation
층상 혼합금속산화물 촉매에 의한 N2O 분해에서 Ceria 첨가 및 CO 환원제의 영향
Effects of Ceria and CO Reductant on N2O Decomposition over the Layered Mixed Oxide Catalysts
양기선, 장길상†
  • 상명대학교 공업화학과, 110-743 서울시 종로구 홍지동 7
Ki Seon Yang, and Kil Sang Chang†
  • Department of Industrial Chemistry, Sangmyung University, 7 Hongji-dong, Jongrho-ku, Seoul 110-743, Korea
E-mail:
초록
온실가스로 알려진 N20의 촉매 분해는 최소한 670 K 이상의 온도가 요구되는 난해한 공정으로 알려져 있다. 본 연구는 CO 환원제와 더불어 473 K의 저온에서도 N2O를 전량 분해될 정도로 높은 활성을 나타내는 혼합금속산화물(mixed metal oxide: MMO) 촉매에 Ce을 첨가함으로서 나타나는 N2O 분해활성에의 영향을 검토하기 위하여 수행되었다. MMO 촉매는 Co 및 AI 외에 Rh과 Pd을 사용하고，여기에 Ce을 미량 첨가하여 공침전법으로 제조하였으며，결과적으로 Ce 함량이 증가함에 따라 촉매 표면적은 감소하고 N2O의 직접분해 활성이 감소하는 현상이 나타났다. 그러나 CO 환원제의 분위기 하에서는 이러한 활성 감소를 상쇄하고도 남을 정도의 높은 N2O 분해활성을 나타냈으며 ce 첨가비율에 따른 활성저하도 줄일 수 있어서 MMO 촉매의 물리적 안정성 증대를 위해 Ce을 첨가할 경우 CO 환원제에 의한 N2O 환원 반응계의 활성 안정성도 유지될 수 있는 것으로 확인되었다.
Nitrous oxide (N2O) is a greenhouse material which is hard to remove. Even with a catalytic process it requires a reaction temperature, at least, higher than 670 K. This study has been performed to see the effects of Ce addition to the mixed oxide catalyst which shows the highest activity in decomposing N2O completely at temperature as low as 473 K when CO is used as a reducing agent. Mixed metal oxide(MMO) catalyst was made through co-precipitation process with small amount of Ce added to the base components of Co, AI and Rh or Pd. Consequently, the surface area of the catalyst decreased with the contents of Ce, and the catalytic activity of direct decomposition of N2O also decreased. However, in the presence of CO, the activity was found high enough to compensate the portion of activity decrease by Ce addition, so that it can be ascertained that the catalytic activity and stability can be maintained in the CO involved N2O reduction system when Ce is added for the physical stability of the catalyst.
Keywords:Greenhouse gas;Nitrogen oxide;Nitrous oxide;Mixed metal oxide catalyst;Ceria;Exhaust gas treatment
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