Ni改性对稀土尾矿NH<sub>3</sub>-SCR脱硝性能的影响

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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 NO_x conversion rate of rare earth tailings catalyst. The NO_x 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.

Key words： rare earth tailings Ni modification catalyst NH₃-SCR comprehensive utilization

Received: 27 August 2022

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X701

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	HOU Li-min
	Lü Bing-yu
	FU Shan-cong
	WU Wen-fei

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HOU Li-min,Lü Bing-yu,FU Shan-cong等. Effect of Ni modification on NH₃-SCR denitrification performance of rare earth tailings[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1574-1581.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I4/1574

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