WO3/TiO2와 V2O5/TiO2 분말의 합성 및 Nox제거 SCR특성
Preparation of WO3/TiO2 and V2O5/TiO2 powders and their catalytic performances in the SCR of NOX
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Anatase TiO2에 WO3 및 V2O5 촉매를 첨가하여 SCR(selective catalytic reduction)용 분말을 합성하였으며, 촉매 첨가가 합성분말의 미세구조, 상합성 및 SCR 촉매능에 미치는 영향에 대해 연구하였다. 촉매의 지지체로 사용된 상용 anatase-TiO2에서 rutile 단일상으로의 상전이 온도는 1200oC이었다. 그러나 WO3를 10 wt% 첨가하면 이 상전이 온도가 900oC로 낮아졌으며, V2O5를 첨가(5와 10 wt%)할 경우 650oC 이하로 낮아졌다. 450oC에서 제조된 WO3(10 wt%)/TiO2 SCR 분말은 350oC~400oC에서 100 %에 가까운 우수한 NOX 변환효율을 보였다. 650oC에서 열처리한 경우, 보다 넓은 300~ 400oC 온도영역에서 100 % 가까운 우수한 촉매능을 보였다. 650oC에서 합성된 V2O5(5 wt%)/TiO2 촉매분말은 넓은 온도범위(250oC~350oC)에 걸쳐 100 %에 달하는 가장 우수한 NOX 변환효율을 보였다. 650oC 합성분말의 경우 10 wt%의 V2O5 첨가는 5 wt% V2O5 첨가 때 보다 분말물성과 촉매물성이 저하되었으며, 이는 V2O5의 높은 반응성으로 인한, 촉매의 입자성장에 따른 비표면적감소 때문으로 해석된다.
Abstract
An investigation of the influence of WO3 and V2O5 catalysts on the microstructure, phase formation and selective catalytic reduction (SCR) efficiency of the synthesized SCR powders has been carried out. A commercial anatase-TiO2 was used as the catalysts support. For WO3(10 wt%)/TiO2, the W loading to the TiO2 support led to the lower in anatase to rutile transition temperature from 1200oC of TiO2 support to ~900oC. The transition temperature was also lowered to below 650oC in the V2O5 (5 and 10 wt%) added composition. The WO3(10 wt%)/TiO2 SCR powder obtained at 450oC showed near 100 % of NOX conversion efficiency at 350~400oC and for the powder prepared at 650oC the same efficiency was achieved in wider temperature range 300~400oC. The highest NOX conversion efficiency of 100 % was obtained in the V2O5(5 wt%)/TiO2 SCR composition calcined at 650oC in the relatively wider temperature range 250~350oC, while the catalytic efficiency considerably decreased for the V2O5(10 wt%)/TiO2. The lowered conversion efficiency of NOX observed in the V2O5(10 wt%)/TiO2 composition calcined at 650oC was considered to be correlated with the lowered surface area resulting from the increased crystallite growth by highly reactive vanadium loading.
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