Study on Simultaneous Catalytic Reduction of Sulfur Dioxide and Nitric Oxide on Rare Earth Mixed Compounds

【Abstract】 CeO₂/γ-Al₂O₃, La₂O₃/γ-Al₂O₃, CeO₂-La₂O₃/γ-Al₂O₃ and CeO₂-La₂O₃, which were prepared by impregnating in certain ratio, were used as the catalysts for the reduction of SO₂ and NO by CO. Separate and simultaneous removal of SO₂ and NO over La₂O₃/γ-Al₂O₃, CeO₂/γ-Al₂O₃, CeO₂-La₂O₃/γ-Al₂O₃ were investigated. The phase characteristics of catalysts were also analyzed by X-ray diffraction. The result shows that the conversions of SO₂ and NO are above 98% over CeO₂/γ-Al₂O₃ and CeO₂-La₂O₃/γ-Al₂O₃. After SO₂ is added in the NO-CO-N₂ system （NO∶SO₂=1∶2～1∶3）, the conversions of SO₂ and NO are both above 98%. Furthermore, it is found that CeO₂-La₂O₃ with various ratios has different activity for the simultaneous reduction of SO₂ and NO.更多还原