K<sup>+</sup>诱导Mn-Ce固溶体增强酸性和活性氧协同促进NH<sub>3</sub>-SCR

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Abstract In this work, K ions were successfully introduced into the lattice of as-prepared Mn-Ce solid solutions (MnCeO_x) by a hydrothermal method, and that was applied in NH₃-SCR. The Mn-O bonding was deeply weakened, leading to a better reducibility and oxygen desorption capacity of the K-contained catalysts according to H₂-TPR and O₂-TPD. Furthermore, the introduction of K ions could facilitate the adsorptive capacity of Brønsted acid sites for NH₃ due to the enhanced electron transfer between Mn/Ce elements according to the characterizations of XPS, NH₃-TPD and in situ DRIFT. Then, the synergy among the acidity and adsorbed active oxygen could promote the activities of catalyst MnCeK_yO_x on NH₃-SCR. With the proportion of 1:5:5 for the amounts of K, Ce and Mn elements, the best performed catalyst MnCeK₁O_x could achieve 94.6% conversion of NO at a lower temperature of 120℃. The broader temperature ranging from 40~260℃ is beneficial for the conversion of NO at many conditions. Finally, in situ DRIFTs of NH₃ and NO adsorption on MnCeO_x and MnCeK₁O_x suggested that the reaction was more sensitive to the adsorption of NH₃ than NO. For MnCeO_x, NH₃ was primarily bound on Lewis then Brønsted acid sites, resulting in the rapid aggregation of both monodentate and bidentate nitrate. For MnCeK₁O_x, the simultaneous adsorption of NH₃ on Lewis and Brønsted acid sites led to less accumulation of intermediates like bidentate nitrate. The results indicated that the introduction of K ions could efficiently improve the activity of Mn-Ce solid solution in NH₃-SCR reaction.

Key words： NH₃-SCR kions Mn-Ce solid solutions acidity active oxygen

Received: 25 March 2024

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X511

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	CHEN Xi
	WANG Xao-yan
	LI Qiao-yan
	WANG Meng-xue
	LIANG Mei-sheng

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CHEN Xi,WANG Xao-yan,LI Qiao-yan等. The synergy between K⁺-induced enhanced acidity and active oxygen in Mn-Ce solid solution for promotion of NH₃-SCR[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(11): 6036-6046.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I11/6036

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