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

• Published in: Chemical engineering & technology Vol. 33; no. 7; pp. 1093 - 1098
• Main Authors: Yao, G.-H., Gui, K.-T., Wang, F.
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.07.2010; WILEY‐VCH Verlag; Wiley-VCH
• Subjects: Applied sciences; Atmospheric pollution; Catalysis; Catalytic reactions; Chemical engineering; Chemistry; De-NOx; Exact sciences and technology; Fluidization; General and physical chemistry; General processes of purification and dust removal; Iron-based catalysts; Low-temperature; Mössbauer spectroscopy; Pollution; Prevention and purification methods; Reactors; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Gaseous effluent; Fluidization; Reactor; Selective catalytic reduction; Magnetic field; X ray diffraction; Flue gas purification; Catalyst; Low temperature; Fluidized bed
• ISSN: 0930-7516; 1521-4125
• DOI: 10.1002/ceat.201000015

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. The SCR De‐NOx with ammonia from synthetic flue gas is investigated at low temperatures in a fluidized reactor with iron‐based catalysts, which are reasonably cheap and less hazardous. The efficiency of the system with Fe2O3 catalysts is high at low temperatures and the maximum efficiency can exceed 90 % at 250 °C. Furthermore, the SCR of NOx on γ‐Fe2O3 catalyst is suitable for operation below 200 °C in fluidized reactors with the effects of magnetic fields.