Low‐Temperature De‐NOx by Selective Catalytic Reduction Based on Iron‐Based Catalysts

Low‐temperature De‐NOx technology is a new topic in the area of flue gas treatment. This paper presents experimental studies on selective catalytic reduction (SCR) of NOx from synthetic flue gas over iron‐based catalysts with ammonia in a fluidized reactor. The iron‐based catalysts used in the experiments are particles of Fe3O4 and γ‐Fe2O3, and they are analyzed by X‐ray diffraction (XRD) and Mössbauer spectroscopy, before and after reaction. It is observed that the efficiency of De‐NOx with γ‐Fe2O3 catalyst is high at temperatures from 200–290 °C and the maximum efficiency is seen to exceed 90 % at 250 °C. The effects of magnetic fields on SCR De‐NOx using γ‐Fe2O3 particles as catalysts are also studied by applying uniform and coaxial magnetic fields to the fluidized bed. The results suggest that SCR De‐NOx on γ‐Fe2O3 catalyst is fit for operation below 200 °C in the fluidized reactor in conjunction with the effects of magnetic fields.