부산대학교 도서관

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)