화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Clean Technology, Vol.21, No.3, 153-163, September, 2015
DOI10.7464/ksct.2015.21.3.153  Export Citation
NO의 암모니아 선택적 촉매환원반응을 위한 철 제올라이트 촉매의 내황성에 미치는 조촉매 효과
The Effect of Promoter on the SO2-resistance of Fe/zeolite Catalysts for Selective Catalytic Reduction of NO with Ammonia
하호정, 최준환1, 한종대†
  • 창원대학교 공과대학 토목환경화공융합공학부, 51140 경남 창원시 의창구 창원대학로 20
  • 1한국기계연구원 부설 재료연구소, 51508 경남 창원시 성산구 창원대로 797
Ho-Jung Ha, Joon-Hwan Choi1, and Jong-Dae Han†
  • School of Civil, Environmental and Chemical Engineering, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon-si, Gyeongnam 51140, Korea
  • 1Korea Institute of Material Science, 797 Changwondae-ro, Seongsan-gu, Changwon-si, Gyeongnam 51508, Korea
E-mail:
초록
Fe/제올라이트 촉매의 저온에서의 NO의 암모니아 선택적 촉매환원반응 활성에 미치는 반응가스 중의 수분과 SO2의 영향을 조사하였다. Fe/제올라이트 촉매에 조촉매로 Mn, Zr과 Ce를 첨가한 Fe/제올라이트 촉매로 수분과 SO2가 포함된 저온에서의 NO의 암모니아 선택적 촉매환원반응에서 조촉매 첨가효과를 조사하였다. 조촉매는 이온교환법으로 철을 담지시킨 Fe/제올라이트 촉매에 건식 함침법으로 첨가하였다. 제올라이트는 디젤엔진에서의 SCR기술의 적용을 위하여 NH4-BEA와 NH4-ZSM-5을 사용하였다. 촉매의 특성은 BET, XRD, SEM/EDS와 TEM/EDS를 사용하여 조사하였다. 반응가스 중에 5% H2O와 100 ppm SO2이 존재하는 경우 Fe/BEA 촉매의 NO 전환율은 200 ℃에서 77%에서 47%로 감소하였다. MnFe/BEA 촉매는 수분과 SO2가 존재하는 경우에 200 ℃에서 53% 이상의 NO 전환율을 나타내며 Fe/BEA 촉매보다 우수한 반응활성을 보였다. Mn은 Fe 성분의 분산도를 증가시키고 Fe의 소중합체 형성을 방지하는 효과를 나타내었다. 첨가제는 Mn이 Zr과 Ce 보다 우수한 특성을 나타내었다. 250 ℃ 이하의 온도에서 Fe/BEA 촉매가 Fe/ZSM-5 촉매보다 우수한 반응특성을 나타내었다.
The effects of H2O and residue SO2 in flue gases on the activity of the Fe/zeolite catalysts for low-temperature NH3-SCR of NO were investigated. And the addition effect of Mn, Zr and Ce to Fe/zeolite for low-temperature NH3-SCR of NO in the presence of H2O and SO2 was investigated. Fe/zeolite catalysts were prepared by liquid ion exchange and promoted Fe/zeolite catatysts were prepared by liquid ion exchange and doping of Mn, Zr and Ce by incipient wetness impregnation. Zeolite NH4-BEA and NH4-ZSM-5 were used to adapt the SCR technology for mobile diesel engines. The catalysts were characterized by BET, X-ray diffraction (XRD), SEM/EDS, TEM/EDS. The NO conversion at 200 ℃ over Fe/BEA decreased from 77% to 47% owing to the presence of 5% H2O and 100 ppm SO2 in the flue gas. The Mn promoted MnFe/BEA catalyst exhibited NO conversion higher than 53% at 200 ℃ and superior to that of Fe/BEA in the presence of H2O and SO2. The addition of Mn increased the Fe dispersion and prevented Fe aggregation. The promoting effect of Mn was higher than Zr and Ce. Fe/BEA catalyst exhibited good activity in comparison with Fe/ZSM-5 catalyst at low temperature below 250 ℃.
Keywords:Selective catalytic reduction;NO;NH3;Fe;Zeolite
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