Abstract: Fe₂O₃，as a denitrification catalyst,was prepared by separatingsolid phase from solid waste rolling sludge by calcination, the physicochemical properties of the catalyst were characterized by X-ray diffraction, NH₃ programmed temperature desorption and H₂ programmed temperature reduction,and its ammonia-selecitve catalytic reduction performance of nitrogen oxides (NO_x) was investigated. The results showed that the catalyst (H-450) prepared under 450℃ air calcinationhad the best denitrification activity at the temperature range 300-400℃, and the NO_x conversion rate was over85%. H-450 mainly exhibited γ-Fe₂O₃ active crystal form, and had abundant low-temperature reducible iron species and B acid, so it had high activity. The results of anti-SO2 and anti-H₂O toxicity tests showed that the toxic effects of both 10% (φ) H₂O and 100 μL/L SO₂ were more serious than those of 10% (φ) H₂O or 100 μL/L SO₂ alone.

Key words: rolling oil sludge, reduction of nitrogen oxide, Fe₂O₃, crystal form, catalyst