首页|Heteroatoms doped iron oxide-based catalyst prepared from zinc slag for efficient selective catalytic reduction of NOx with NH3
Heteroatoms doped iron oxide-based catalyst prepared from zinc slag for efficient selective catalytic reduction of NOx with NH3
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Excessive emissions of nitrogen oxides from flue gas have imposed various detrimental impacts on environment,and the development of deNOx catalysts with low-cost and high performance is an urgent requirement.Iron oxide-based material has been explored for promising deNOx catalysts.However,the unsatisfactory low-temperature activity limits their practi-cal applications.In this study,a series of excellent low-temperature denitrification catalysts(Ha-FeOx/yZS)were prepared by acid treatment of zinc slag,and the mass ratios of Fe to impure ions was regulated by adjusting the acid concentra-tions.Ha-FeOx/yZS showed high denitrification performance(＞90％)in the range of 180-300 ℃,and the optimal NO conversion and N2 selectivity were higher than 95％at 250 ℃.Among them,the Ha-FeOx/2ZS synthesized with 2 mol/L HNO3 exhibited the widest temperature window(175-350 ℃).The excellent denitrification performance of Ha-FeOx/yZS was mainly attributed to the strong interaction between Fe and impurity ions to inhibit the growth of crystals,making Ha-FeOJyZS with amorphous structure,nice fine particles,large specific surface area,more surface acid sites and high chemisorbed oxygen.The in-situ DRIFT experiments confirmed that the SCR reaction on the Ha-FeOx/yZS followed both Langmuir-Hinshelwood(L-H)mechanism and Eley-Rideal(E-R)mechanism.The present work proposed a high value-added method for the preparation of cost-effective catalysts from zinc slag,which showed a promising application prospect in NOx removal by selective catalytic reduction with ammonia.
College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China
School of Chemistry and Chemical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China
School of Resources Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China
National Natural Science Foundation of ChinaNatural Science Basic Research Program of ShaanxiPostdoctoral Research Foundation of the Xi'an University of Architecture and Technology
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