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• W2103274220 abstract "<TEX>$V_2O_5-WO_3/TiO_2$</TEX> 촉매의 질소산화물 환원반응에 있어서 <TEX>$V_2O_5$</TEX> 함량이 NO 환원 및 <TEX>$N_2O$</TEX> 생성에 미치는 영향을 조사하기 위하여 분말촉매를 사용한 미분반응기에서 실험 연구를 수행하였다. 고정된 비율의 <TEX>$WO_3$</TEX>와 <TEX>$TiO_2$</TEX>에 <TEX>$V_2O_5$</TEX> 함량을 1에서 8 wt%까지 변화시킨 촉매에서 NO 환원반응과 암모니아 산화반응 특성이 조사되었다. <TEX>$V_2O_5-WO_3/TiO_2$</TEX> 촉매에서 NO 환원 반응은 <TEX>$200^{circ}C$</TEX> 이하에서도 상당량 진행되지만, <TEX>$V_2O_5$</TEX> 함량을 1 wt% 촉매의 경우 700 ppm의 NO를 99.9%이상 전환시키는 최저 반응온도가 <TEX>$340^{circ}C$</TEX>에서 아주 좁은 활성 온도창으로 일어났다. 그리고 이 활성온도는 촉매의 <TEX>$V_2O_5$</TEX> 함량이 증가됨에 따라 점점 저온 쪽으로 이동하여, 6 wt% 촉매의 경우 <TEX>$220{sim}340^{circ}C$</TEX>에서 높은 활성을 보였다. <TEX>$V_2O_5$</TEX> 함량이 8 wt% 촉매의 경우 전 온도 구간에서 6 wt% 촉매보다 낮은 NO 환원율을 보였다. 그러나 반응온도 <TEX>$340^{circ}C$</TEX> 이상에서는 촉매의 <TEX>$V_2O_5$</TEX> 함량이 증가함에 따라 NO 전환율이 감소하였다. 이는 <TEX>$V_2O_5-WO_3/TiO_2$</TEX> 촉매의 NO 환원을 위한 촉매 활성점 상당 크기 이상의 <TEX>$V_2O_5$</TEX> 입자와 관계되는 것으로 판단되며 촉매 입자가 클수록 <TEX>$320^{circ}C$</TEX> 이상에서 암모니아 산화에 의해 발생되는 <TEX>$N_2O$</TEX> 생성을 고려하여야 한다. <TEX>$V_2O_5-WO_3/TiO_2$</TEX> 촉매는 배기가스 중의 질소산화물 제거를 위하여 현재 통상적으로 <TEX>$350{sim}450^{circ}C$</TEX>의 영역에서 운전되고 있으나, 고온 영역에선 2차 오염물인 <TEX>$N_2O$</TEX>의 발생을 피할 수 없고 에너지 소비량이 많으므로, <TEX>$250{sim}320^{circ}C$</TEX>의 저온 영역에서 적합한 촉매로써 <TEX>$V_2O_5$</TEX> 함량이 높은 <TEX>$V_2O_5-WO_3/TiO_2$</TEX> 촉매의 사용이 권장되었다. In order to investigate the effect of <TEX>$V_2O_5$</TEX> loading of <TEX>$V_2O_5-WO_3/TiO_2$</TEX> catalyst on the NO reduction and the formation of <TEX>$N_2O$</TEX>, the experimental study was carried out in a differential reactor using the powder catalyst. The NO reduction and the ammonia oxidation were, respectively, investigated over the catalysts compose of <TEX>$V_2O_5$</TEX> content (1~8 wt%) based on the fixed composition of <TEX>$WO_3$</TEX> (9 wt%) on <TEX>$TiO_2$</TEX> powder. <TEX>$V_2O_5-WO_3/TiO_2$</TEX> catalysts had the NO reduction activity even under the temperature of <TEX>$200^{circ}C$</TEX>. However, the lowest temperature for NO reduction activity more than 99.9% to treat NO concentration of 700 ppm appeared at 340 with very limited temperature window in the case of 1 wt% <TEX>$V_2O_5$</TEX> catalyst. And the temperature shifted to lower one as well as the temperature window was widen as the <TEX>$V_2O_5$</TEX> content of the catalyst increased, and finally reached at the activation temperature ranged <TEX>$220{sim}340^{circ}C$</TEX> in the case of 6 wt% <TEX>$V_2O_5$</TEX> catalyst. The catalyst of 8 wt% <TEX>$V_2O_5$</TEX> content presented lower activity than that of 8 wt% <TEX>$V_2O_5$</TEX> content over the full temperature range. NO reduction activity decreased as the <TEX>$V_2O_5$</TEX> content of the catalyst increased above <TEX>$340^{circ}C$</TEX>. The active site for NO reduction over <TEX>$V_2O_5-WO_3/TiO_2$</TEX> catalysts was mainly related with <TEX>$V_2O_5$</TEX> particles sustained as the bare surface with relevant size which should be not so large to stimulate <TEX>$N_2O$</TEX> formation at high temperature over <TEX>$320^{circ}C$</TEX> according to the ammonia oxidation. Currently, <TEX>$V_2O_5-WO_3/TiO_2$</TEX> catalysts were operated in the temperature ranged <TEX>$350{sim}450^{circ}C$</TEX> to treat NOx in the effluent gas of industrial plants. However, in order to save the energy and to reduce the secondary pollutant <TEX>$N_2O$</TEX> in the high temperature process, the using of <TEX>$V_2O_5-WO_3/TiO_2$</TEX> catalyst of content <TEX>$V_2O_5$</TEX> was recommended as the low temperature catalyst which was suitable for low temperature operation ranged <TEX>$250{sim}320^{circ}C$</TEX>." @default.
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• W2103274220 date "2013-06-01" @default.
• W2103274220 modified "2023-10-18" @default.
• W2103274220 title "The Effect of Vanadium(V) Oxide Content of V₂O₅-WO₃/TiO₂Catalyst on the Nitrogen Oxides Reduction and N₂O Formation" @default.
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• W2103274220 doi "https://doi.org/10.9713/kcer.2013.51.3.313" @default.
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