Effect of the Mn oxidation state and lattice oxygen in Mn_based TiO2 catalysts on the low-temperature selective catalytic reduction of NO by NH3
- Effect of the Mn oxidation state and lattice oxygen in Mn_based TiO2 catalysts on the low-temperature selective catalytic reduction of NO by NH3
- 권동욱; 이상문; 박광희; 김성수; 홍성창
- Issue Date
- JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION
- VOL 62, NO 9-1092
- TiO2-supported manganese oxide catalysts formed using different calcination temperatures were prepared by using the wet-impregnation method and were investigated for their activity in the low-temperature selective catalytic reduction (SCR) of NO by NH3 with respect to the Mn valence and lattice oxygen behavior. The surface and bulk properties of these catalysts were examined using Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction (XRD), temperature-programmed reduction (TPR), and temperature-programmed desorption (TPD). Catalysts prepared using lower calcination temperatures, which contained Mn4+, displayed high SCR activity at low temperatures and possessed several acid sites and active oxygen. The TPD analysis determined that the Bronsted and Lewis acid sites in the Mn/TiO2 catalysts were important for the low-temperature SCR at 80 similar to 160 and 200 similar to 350 degrees C, respectively. In addition, the available lattice oxygen was important for attaining high NO to NO2 oxidation at low temperatures.
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