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

Abstract

CeO 2/γ-Al 2O 3, La 2O 3/γ-Al 2O 3, CeO 2-La 2O 3/γ-Al 2O 3 and CeO 2-La 2O 3, which were prepared by impregnating in certain ratio, were used as the catalysts for the reduction of SO 2 and NO by CO. Separate and simultaneous removal of SO 2 and NO over La 2O 3/γ-Al 2O 3, CeO 2/γ-Al 2O 3, CeO 2-La 2O 3/γ-Al 2O 3 were investigated. The phase characteristics of catalysts were also analyzed by X-ray diffraction. The result shows that the conversions of SO 2 and NO are above 98% over CeO 2/γ-Al 2O 3 and CeO 2-La 2O 3/γ-Al 2O 3. After SO 2 is added in the NO-CO-N 2 system (NO:SO 2 = 1:2 ∼ 1:3), the conversions of SO 2 and NO are both above 98%. Furthermore, it is found that CeO 2-La 2O 3 with various ratios has different activity for the simultaneous reduction of SO 2 and NO.