Research on Fe-ZSM-5 catalyzed S2O82-removal of Hg0 from flue gas
Mercury is one of the main pollutants in coal-fired power plants.Hg0,whose removal from the flue gas is difficult,thus is the main form of mercury emissions from coal-fired power plants.Persulfate can effectively oxidize and remove Hg0,but its poor reaction efficiency limits its industrial application in coal-fired power plants.This paper first conducts the catalytic oxidation reaction between S2O82-and Hg0,and successfully prepares Fe-ZSM-5 catalysts with different Fe contents using commercial H-ZSM-5 as raw material through impregnation method.The prepared catalyst is characterized by the analysis methods such as ESEM-EDS,XRD,BET,and XPS.We find that with the rise of Fe loading,the dispersion of the molecular sieve surface increases and Fe is uniformly distributed on the surface,which is conducive to the catalytic reaction.Meanwhile,the impregnated Fe mainly exists in the form of Fe2+and Fe3+in ZSM-5.The rise of Fe loading also cause an increase in the proportion of Fe2+,which greatly promotes the oxidation reaction.Fe mainly exists in the form of Fe-Si-O,and ZSM-5 maintains its intact skeleton structure and pore shape after being modified by iron.Our experimental results show the best effect is achieved when 3.0Fe-ZSM-5 is used as a catalyst,and the highest efficiency of Hg0 oxidation removal reaches 88.31％.
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