바이오디젤 생산용 고체 촉매의 개발 동향 및 과제

Recent Developments and Challenging issues of Solid Catalysts for Biodiesel Production

  • 이진석 (한국에너지기술연구원 바이오에너지연구센터) ;
  • 박순철 (한국에너지기술연구원 바이오에너지연구센터)
  • Lee, Jin-Suk (Bio-energy Research Center, Korea Institute of Energy Research) ;
  • Park, Soon-Chul (Bio-energy Research Center, Korea Institute of Energy Research)
  • 투고 : 2009.08.01
  • 심사 : 2009.11.25
  • 발행 : 2010.02.28

초록

다양한 원료유로부터 바이오디젤을 효율적으로 생산할 수 있는 고체촉매 개발을 위한 연구가 활발하게 진행되고 있다. 다양한 고체촉매 중 금속산화물계 촉매와 이온교환수지 촉매가 특히 유망한 것으로 평가되고 있다. 금속 산화물계 촉매의 경우 고체 촉매의 활성을 높이기 위해 반응 활성이 높은 촉매성분과 지지체의 탐색 및 촉매 성분을 지지체에 안정적으로 담지할 수 있는 기술이 주로 연구되고 있다. 특히 금속 산화물 촉매는 열적 안정성이 우수하여 고온이 요구되는 폐유지의 전이에스테르화- 에스테르화 동시 반응 시스템에서 활용성이 높을 것으로 평가된다. 이온교환수지 촉매는 반응 온도가 제한되므로 유리지방산의 에스테르화 반응 연구에 주로 적용되고 있다. 두 가지 고체촉매 모두 상용화 공정에 적용을 위해서는 보다 많은 연구가 진행되어야 한다. 특히 고체 촉매의 재사용에 따른 활성 저하 문제 해결이 주 과제가 될 것으로 보인다.

Intensive works have been carried out to develop more efficient solid catalysts for biodiesel production from various feedstocks including refined oils and waste fats. Among many catalysts, metal oxides and ion exchange resins are the most intensively studied ones. With regard to metal oxide catalysts, major research activities have focused on the identification of the active compounds and their immobilizing methods on the supports. As metal oxide catalysts have strong thermal stability, they may be used in simultaneous transesterification and esterification of waste fats. However, ion exchange resin catalysts were mainly applied in the esterification of the free fatty acids in waste fats because of their lower thermal stability. For both solid catalysts, further works are needed to make them to be used in commercial process. Especially fast deactivation of the solid catalyst would be the most challenging problem.

키워드

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