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Vol.57, No.4, 270 ~ 278, 2019
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| Title |
| Adsorption / Desorption Performance and NOx Removal Efficiency of BaO Loaded V2O5-WO3/TiO2 Selective Catalytic Reduction Catalyst |
| 김진우 Jin Woo Kim , 예보라 Bora Ye , 이민우 Minwoo Lee , 정보라 Bora Jung , 이덕현 Duck Hyun Lee , 이희수 Heesoo Lee , 김홍대 Hong-dae Kim |
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| Abstract |
| Recently, directly emitted NOx upon start-up has been spotlighted as a significant emissions problem. BaO loaded V2O5-WO3/TiO2 Selective Catalytic Reduction (SCR) catalysts were synthesized with various contents of barium which was a representative NOx adsorbent and their NOx adsorption, desorption, and removal efficiency were shown. The phase of BaO was changed to a BaO or BaCO3 phase, which is capable of NOx adsorption when loaded on the TiO2 support. The more BaO contents were increased, the higher the intensity of Ba2+, the NOx adsorption site, measured by FT-IR. Also, NOx storage capacities of the BaO loaded catalysts, which contained 5 wt% and 10 wt% of BaO, were calculated to be 12.59 μmol/g and 20.21 μmol/g at 200 ℃ respectively. The improvement in NOx storage capacity was explained by the increase in BaO content. And then the BaO loaded catalyst desorbed NOx in the temperature range of 345 to 360 ℃, which was the catalyst operating temperature. The NOx removal efficiency increased by reducing BaO content, and the catalyst loaded with 3 wt% of BaO showed 98% NOx removal efficiency at 350 ℃. The adsorbed NOx at 200 ℃ was desorbed at 300~400 ℃ and then removed by the SCR reaction. The synthesized NOx trap functional SCR catalyst can be applied to reduce the NOx generated at the time of equipment start-up at low temperatures.
(Received January 7, 2019; Accepted March 8, 2019) |
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| Key Words |
| selective catalytic reduction, NOx Trap, NOx removal efficiency, NOx adsorption, NOx desorption |
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