Mn/Zr改性稀土尾矿催化剂NH<sub>3</sub>-SCR脱硝机理分析

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Abstract Mn and Mn/Zr modified rare earth tailings-based NH₃-SCR catalysts were prepared using the sol-gel method. The catalysts were characterized using a catalyst activity evaluation system, along with H₂-TPR, NH₃-TPD, XRD, and DRIFT techniques, to investigate the denitration process and reaction mechanism. The results showed that the denitration activity of the Mn and Mn/Zr modified rare earth tailings catalysts was significantly enhanced, with a denitration activity of 96% achieved at 200℃ for the 6%Mn1%Zr/rare earth tailings catalyst. The modified catalysts exhibited increased oxygen vacancies and acidic sites on the surface, as well as a higher adsorption capacity. The increase in reducible surface area of the catalysts contributed to the improvement of their redox performances. The reaction between NH₄⁺ and gaseous NO₂ on the acidic sites of the catalysts followed the E-R mechanism, while the reactions between NH₄⁺ and monodentate and bidentate nitrate species followed the L-H mechanism.

Key words： rare earth tailings Mn、Zr modified catalysts NH₃-SCR denitration mechanism

Received: 13 March 2023

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X511

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	JIAO Kun-ling
	JIAO Xiao-yun
	LIU Jia-jie
	LI Na
	HOU Li-min
	WU Wen-fei

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JIAO Kun-ling,JIAO Xiao-yun,LIU Jia-jie等. A Study of Mn/Zr modification for NH₃-SCR denitration mechanism of rare earth tailings[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5655-5662.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I11/5655

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