Comparison on the Performance of α-Fe2O3 and γ-Fe2O3 for Selective Catalytic Reduction of Nitrogen Oxides with Ammonia
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γ-Fe2O3 catalyst showed higher catalytic activity than α-Fe2O3 in 150–300 °C. Both NH3 and NO x species adsorbed and reacted easily on γ-Fe2O3. However, NH3 adsorbed on α-Fe2O3 and then reacted with gaseous NO x . Gaseous NO x was more easily adsorbed on α-Fe2O3 than gaseous NH3, consequently, stable nitrates formed and blocked the active sites, which affected the SCR reaction badly.
KeywordsSelective catalytic reduction (SCR) NOx abatement γ-Fe2O3 α-Fe2O3
This work was financially supported by National Natural Science Fund of China (Grant No. 51078203) and the National High-Tech Research and Development (863) Program of China (Grant No. 2010AA065001 and 2012AA062506).