탄화수소에 의한 NO의 선택적 촉매 환원 반응에서 Pt/MCM-48 촉매의 반응 메커니즘에 관한 연구

양재승; 이성철; 장재훈; 이병용; 정석진; Jae-Seung Yang; Sung-Chul Lee; Jae-Hun Jang; Byung-Yong Lee; Suk-Jin Choung

HWAHAK KONGHAK, Vol.41, No.4, 426-431, August, 2003

Export Citation

탄화수소에 의한 NO의 선택적 촉매 환원 반응에서 Pt/MCM-48 촉매의 반응 메커니즘에 관한 연구

Studies on Reaction Mechanism of Pt/MCM-48 Catalysts in Selective Catalytic Reduction of NO by Hydrocarbon

양재승, 이성철, 장재훈, 이병용, 정석진 ^†

경희대학교 환경응용화학대학, 449-701 경기도 용인시 기흥읍 서천리 1

Jae-Seung Yang, Sung-Chul Lee, Jae-Hun Jang, Byung-Yong Lee, and Suk-Jin Choung^†

College of Environmental Applied Chemistry, KyungHee University, 1 Seocheon-ri,Kiheung-up, Yongin, Gyeonggi 449-701, Korea

E-mail:

초록

기본형의 Si-MCM-48에 알루미늄 치환량과 귀금속 담지량의 변화에 따라 다양한 촉매를 제조하였고, 이를 탄화수소에 의한 선택적 촉매 환원(HC-SCR) 반응에 적용하여 각각의 NO 환원반응 특성을 비교 고찰하였다. Pt/MCM-48 촉매의 NO 환원 활성을 고찰한 결과, 문헌상 보고 되고 있는 Pt/ZSM-5 촉매를 이용한 NO의 제거 활성과 비교하여 매우 우수한 결과를 보였다. 또한 5 vol% 이하의 산소 조건에서 그 활성이 현저하였으며, 특이하게 최고 활성에 도달한 후에 반응온도가 600 ℃ 까지 증가하여도 계속하여 그 활성을 유지하였다. XRD, TPD, TGA, XPS 등의 특성화를 통해 촉매의 표면 특성 및 반응 mechanism에 관한 연구를 수행하였으며, 이러한 결과로부터 Pt/MCM-48 촉매가 기존 촉매보다 일정 산소 조건에서 우수한 성능을 보이는 것은 담체의 표면 산특성과 촉매 고유의 redox mechanism에 기인한 것으로 해석하였다.

Pt supported on MCM-48 was tested as a new catalyst for hydrocarbon-SCR process. MCM-48 is a new support material of the catalyst for SCR. Characterization and de-NOx activity test were performed for the newly synthesized MCM-48-supported catalysts. Pt(1 wt%)/MCM-48 showed 90% of NO reduction at 250-500 ℃. It should be concluded, from what has been said above, that Pt/MCM-48 catalysts showed higher NO reduction conversion than zeolite based catalyst, and it was not affected by 5 vol% O2 concentration and water vapor addition. It would be supposed that sustention of activity in that oxygen condition might be caused by surface acidic characteristic and its characteristic redox mechanism.

Keywords:Hydrocarbon S.C.R.;Mesoporous Material;De-NOx;Redox Mechanism

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[3] Lietti L, Savachula J, Forzatti P, Ramis G, Bregani P, Catal. Today, 17, 131 (1992)

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