Research on NH3-SCR Denitration Activity and SO2/H2O Tolerance of NH3SO3-Modified Rare Earth Tailings Catalyst
Different mass fractions of NH3SO3-modified rare earth tailings NH3-SCR denitration catalysts were prepared using ball milling and microwave roasting methods.The denitration activity and SO2/H2O tolerance of the catalysts were analyzed by BET,SEM-EDS,XRD,NH3-TPD and H2-TPR.The results show that NH3SO3 modification significantly improves the denitration activity of the catalysts,and the de-nitration activity of the 10％NH3SO3-modified catalyst could reach about 90％at 300～350 ℃.The com-bined action of SO2/H2O can further improve the denitration activity of the 10％NH3SO3-modified cata-lyst to 97％,and its promoting effect remains stable and reversible.After the rare earth tailings are modi-fied by NH3SO3,the specific surface area,acidic sites,and strength of the catalysts increace.The dispersion of surface active substances of the tailings is improved,and the crystalline structure is weakened.The ad-sorption capacity and redox ability of the catalysts are improved,thereby enhancing catalytic denitration ac-tivity and maintaining excellent SO2/H2O tolerance.
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