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Korean Chemical Engineering Research,
Vol.52, No.4, 443-450, 2014
Vol.52, No.4, 443-450, 2014
Pt-MnOx/ZrO2-SiO2 촉매에서 수소에 의한 일산화질소의 선택적 촉매 환원반응
Selective Catalytic Reduction of NO by H2 over Pt-MnOx/ZrO2-SiO2 Catalyst
지르코니아를 고정한 실리카(ZrO2-SiO2)와 망가니즈 산화물(MnOx)에 백금을 담지하여 제조한 촉매에서 수소에 의한 일산화질소의 선택적 촉매 환원(H2-SCR) 반응을 조사하였다. Pt-MnOx 촉매에서는 NO 전환율이 낮으며, N2O와 NO2 생성이 억제되었다. 반면, Pt/ZrO2-SiO2 촉매에서는 NO 전환율이 높지만, 100~150 ℃에서는 N2O가, 200~300 ℃에서는 온도가 높아지면 NO2 수율이 높아져, N2 수율이 낮았다. ZrO2-SiO2에 MnOx와 백금을 같이 담지한 Pt-MnOx/ZrO2-SiO2 촉매에서는 100~150 ℃에서 이들 성분의 상승작용으로 N2 수율이 조금 높아졌다. 이들 촉매에서 표면 조성, 산화 상태, 산성도를 조사하고, NO가 흡착되어 수소와 반응하는 과정의 IR 스펙트럼을 그렸다. NO의 H2-SCR 반응에서
전환율과 생성물 수율을 촉매 구성 성분의 촉매작용과 연계지어 고찰하였다.
Selective catalytic reduction of nitrogen monoxide by hydrogen (H2-SCR of NO) over platinum catalysts impregnated on zirconia-incorporated silica (ZrO2-SiO2) and manganese oxide (MnOx) was investigated. Pt-MnOx catalyst showed low conversions and low yields of N2O and NO2 at 100-350 ℃. On the other hand, NO conversions over Pt/ZrO2-SiO2 were very high, but N2O was predominantly produced at 100-150 ℃ and the yield of NO2 increased with temperature at 200-300 ℃, resulting in poor N2 yields. Pt-MnOx/ZrO2-SiO2 exhibited a small enhancement in N2 yield
at 100-150 ℃ due to the synergy of MnOx and ZrO2-SiO2. The surface composition and oxidation state of the catalyst components and the acidity of the catalysts were examined. IR spectra of the adsorption of NO and their subsequent reactions with hydrogen on these catalysts were also recorded. The variations of conversion and product yield according to the catalyst components in the H2-SCR of NO were discussed in relation to their catalytic roles.
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