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Mordenite 형 제올라이트상에서 탄화수소를 이용한 질소산화물의 선택적 제거
김문현,남인식,김영걸,이중기,박달근 ( Moon Hyeon Kim,In Sik Nam,Young Gul Kim,Joong Kee Lee,Dal Keun Park ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.3
The reduction of NO by hydrocarbons such as C₂H₄, C₂H_6, C₃H_6, and C₃H_8 has been investigated over mordenite type zeolite catalysts. HM, CuHM, NZA, and CuNZA were prepared by ion-exchange method and thier deNO_χ efficiency was examined in a continuous flow fixed-bed reactor. As a result of the activity test, C₂H₄ appeared to be the best reductant over HM and C₃H_6 over CuNZA. The reaction variables for C₃H_6-CuNZA system have been examined for its optimal operating condition. NO conversion reaches about 94% by the feed of 2,000 ppm of C₃H_6 at 500℃. The highest conversion of NO was observed at 2.0% of O₂. NO conversion of CuNZA depends on the exchange level of copper ions on the catalyst structure. No deterioration of the catalytic activity for CuNZA was observed at above 400℃ even after 30 hours of on-stream time. Based upon the transient test of CuNZA catalyst with the shut-off of reactants. C_(n`)H_(m`)(O) might be a reaction intermediate. N₂O formed in the reaction may play an important role for HM catalyst at the reaction temperature above 400℃. It can be concluded that CuNZA is a highly active and promising catalyst for the reduction of NO with C₃H_6. The reaction path of this catalytic system is the most important key for the high accomplishment of NO conversion.