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NO 환원반응을 위한 V₂O?/TiO₂계 촉매필터의 MnO₂ 조촉매 효과
신해중(Hae Joong Shin),최재호(Jae Ho Choi),송영환(Young Hwan Song),이주영(Ju Young Lee),장성철(Sung Cheol Jang),최주홍(Joo Hong Choi) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
Nitrogen oxides (NO, NO₂ and N₂O) have been controlled effectively by the SCR catalysts coated on monolith or honeycomb in commercial sites with ammonia as reductant at high temperature range 300~400℃. However, the catalytic filter has much merit on the point of controlling the particles and nitrogen oxides simultaneously. It will be more advanced-system if the catalytic working temperature is reduced to the normal filtration temperature of under 200℃. This study has focus on the development of the catalytic filter working at the low temperature. So the additive effect of the components such as Pt and Mn (which are known the catalytic component of V₂O5/TiO₂ was investigated. The V₂O?-WO₃ catalytic filter exhibited high activity and selectivity at 250~320℃ showing more than 95% NO conversion for the treatment of 600 ppm NO at face velocity 2 cm/s. The Pt-V₂O?-WO₃ catalytic filter shifted the optimum working temperature towards the lower temperature (170~200℃). And NO conversion was 100% and higher than that of V₂O?-WO₃ catalyst at 250~320℃. The MnOX-V₂O?-WO₃ catalytic filter showed the wide temperature range of 220~330℃ for more than 95% NO conversion. This is a remarkable advantage when considered the MnOX catalytic filter presents the maximum activity at 150~250℃ and V₂O?-WO₃ catalytic filter shows the maximum activity at 250~320℃.