VPO/TiO<sub>2</sub>催化剂表面酸性位调控及低温NH<sub>3</sub>-SCR脱硝性能研究

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Abstract HCl was used to modify the surface acidity of supported vanadium phosphorus oxide (VPO/TiO₂) catalysts for NH₃-SCR. The results show that the denitration activity of catalyst was the highest with HCl/V molar ratio of 3~5:1, and the efficiency was almost 100% when the reaction temperature reached 200℃. It was found that the addition of HCl improved the crystallinity of the catalyst, and the modification of HCl could slightly increase the specific surface area of the VPO/TiO₂ catalyst. Meanwhile, the amount of active component V⁴⁺ in the VPO/TiO₂ catalyst was gradually increased from 38% to 46%, which improved the redox performance of the catalyst. In addition, the relative content of chemisorbed oxygen in the catalysts with different HCl/V molar ratios increased with the increase of HCl addition amount. The pyridine infrared test results show that HCl affected the acid site of the catalyst, and the catalyst with HCl/V molar ratio=5 had the highest Lewis acid content as 0.84×10^-4mol/g. Data fitting results further demonstrate that the low-temperature denitration activities of all VPO/TiO₂ catalysts were positively correlated with the amount of weak Lewis acid (correlation coefficient > 0.9), which is consistent with the results of activity test.

Key words： VPO/TiO₂ catalyst low temperature NH₃-SCR denitration surface acidity regulation

Received: 29 August 2022

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X701

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	CHEN Yi-hua
	WANG Pan
	MENG Fan-yu
	CHEN Ya-fen
	ZHANG Ming
	JIA Yong

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CHEN Yi-hua,WANG Pan,MENG Fan-yu等. The optimization of surface acidity VPO/TiO₂ catalyst and its low-temperature NH₃-SCR denitration performance[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1558-1566.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I4/1558

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