바나듐 담지된 그래핀 나노복합체를 첨가한 SCR 촉매의 제조 및 활성 평가
De-NOX evaluation of SCR catalysts adding vanadium-graphene nanocomposite
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초록
질소산화물 (NOX)은 고정원(화력발전소, 산업시설) 및 이동원(자동차, 선박) 등에서 배출되어지며, 발암물질 및광화학 스모그의 주범으로 작용하고 있다. 선택적 촉매 환원법(SCR)은 NOX를 제거하는 가장 효율적인 방법이며, 상업용으로 사용되어지는 V2O5-WO3/TiO2계 촉매에서 V2O5 함량은 0.5~3 wt%, WO3 함량은 5~10 wt%이다. 촉매 성분 중 V2O5의 경우 NOX 환원 반응을 통해 촉매 작용을 촉진시키지만, 과량으로 첨가될 경우, SO2에서 SO3로의 산화 반응을 증가시킨다. 본 연구에서는 높은 탈질 효율을 유지시킴과 더불어, 바나듐의 함량을 줄이기 위하여, 그래핀을 바나듐 담지 matrix로 사용하여 나노복합체를 합성하였으며, 합성된 나노복합체를 첨가하여 Honeycomb형 1 inch SCR 촉매를 제조하였다. 제조된SCR 촉매는 XRD(X-ray Diffraction), XRF(X-ray Fluorescence Spectrometer), BET(Brunauer, Emmett & Teller) 등의 분석을통해 물성 평가를 진행하였으며, Micro Reactor(MR)를 이용하여 활성평가를 진행하였다. 그 결과, 촉매 상용 운전 온도인350 o C에서 나노복합체가 첨가된 SCR 촉매의 탈질 효율은 77.1 %로 상용촉매의 탈질 효율인 77.8 %와 유사한 효율을 나타내는 것을 확인하였다.
Abstract
Nitrogen oxides (NOX) was emitted from flue gas of stationary sources and exhaust gas of mobile sources, can leads to various environments problems. Selective Catalysts Reduction (SCR) is the most effective NOX removal system. Commercial V2O5-WO3/TiO2 catalysts, usually containing V2O5 0.5~3 wt%, WO3 5~10 wt%, and V2O5 is active in the reduction of NOX but also in the desired oxidation of SO2 to SO3. To reduce the amount of vanadium, using graphene matrix supported vanadium to synthesize nanocomposite. Then, we fabricated to 1 inch honeycomb type of SCR catalysts adding graphene-vanadium nanocomposite. The chemical-physical characteristics and the catalytic activity were performed by XRD, XRF, BET and Micro-Reactor (MR). As a result, the De-NOX performance was showed, similar to the commercial catalyst activity as 77.8 % and using nanocomposite catalyst as 77.1 % at 350 o C.
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