Abstract: The influences of practical technological conditions of SNOX method on the catalytic removal efficiencies of NO_○x and SO₂ from flue gas were studied experimentally. For studying the catalytic reduction reaction of NO_○x， CuO/γ-Al₂O₃catalyst was prepared by impregnation method. The influences of reaction temperature， space velocity， n(NH₃)/n(NO_○x) and SO₂ concentration on the conversion rate of NO_○x were investigated. For studying the catalytic oxidation reaction of SO₂， V₂O₅ catalyst was applied. The influences of reaction temperature， space velocity， n(O₂)/n(SO₂) on the conversion rate of SO₂ were investigated. Based on the experimental results， kinetic calculations for the reactions were carried out. The results showed that， under the optimum conditions， the reduction rate of NO_○x can reach 87.5%， and after two stages of oxidation， the conversion rate of SO₂ can reach 94.3%.

Key words: denitrification, desulphurization, CuO/γ-Al₂O₃ catalyst, V₂O₅ catalyst, dynamics