首页|Denitrification characteristics and reaction mechanism of Ce-doped Fe-based catalysts from modified metallurgical dust containing iron
Denitrification characteristics and reaction mechanism of Ce-doped Fe-based catalysts from modified metallurgical dust containing iron
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Metallurgical dust(MD)was used as raw material to prepare rare earth Ce-doped Fe-based catalysts.The results show that the Ce0.1/AMD-300 ℃ catalyst prepared from acid-modified diatomite(AMD)with mCe/mMD=0.1(mCe and mMD are the mass of Ce and MD,respectively)after being roasted at 300 ℃ can reach 99％NOx removal rate in the wide temperature range of 230-430 ℃ and exhibits excellent SO2 and H2O resistance.The MD effectively removes alkali metal elements by the modification process,increases the specific surface area and optimizes the pore structure of MD.The doping of Ce element makes Fe-based catalysts have more surface adsorbed oxygen Oα and a higher Ce3+/Ce4+ratio.Through ammonia temperature-programmed desorption and hydrogen temperature-programmed reduction,it was found that the strong interaction between cerium and iron promotes the formation of more oxygen cavities in the catalyst,thereby generating more active and easily reducible oxygen species and promoting the transformation of Brønsted acid site to Lewis acid site.The research results provide a theoretical basis for the preparation of efficient and inexpensive Fe-based catalysts from MD.
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