Effect of Ni modification on NH3-SCR denitrification performance of rare earth tailings
HOU Li-min1,2, Lü Bing-yu1, FU Shan-cong1, WU Wen-fei1,3
1. Key Laboratory of Efficient and Clean Combustion, School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China; 2. Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Baotou 014010, China; 3. Provincial Co-construction and Collaborative Innovation Center of Efficient and Comprehensive Utilization of Co-associated Mineral Resources in Bayan Obo, Baotou 014010, China
Abstract：Ni modified rare earth tailings catalysts with different proportions were prepared by hydrothermal method. The effects of Ni modification on the catalyst performance were analyzed by XRD, BET, H2-TPR, NH3-TPD and XPS characterization methods.The results show that Ni modification could significantly increase the NOx conversion rate of rare earth tailings catalyst. The NOx conversion rate of 6%Ni/ rare earth tailings catalyst reached 85% at 300℃, the selectivity of N2 was over 76% in the temperature range from 250℃ to 300℃. After modification, NiFe2O4 with good dispersibility was generated in the catalyst, The specific surface area increased to 75.12m2/g, the acidic sites of the catalyst increase, which is conducive to the adsorption of more ammonia on the catalyst surface, the Ni ions act as electron transporters, converting Fe2+ into Fe3+, the chemical valence of Fe increases, the instability of the outermost electrons of iron increases, the oxidation capacity increases, the enhanced oxidation capacity is conducive to the activation of ammonia adsorbed species on the catalyst surface and the denitrification reaction.
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