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Regeneration of alkali metal K deactivation in low-temperature manganese-based SCR catalyst

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Abstract

Based on the MnOx/TiO2 catalyst prepared by the sol–gel method as the substrate, the impregnation method was used to simulate the deactivation process of the alkali metal K of the MnOx/TiO2 catalyst, and the regeneration experiment of the deactivated K–MnOx/TiO2 catalyst was carried out by water washing and acid washing. The effects of methods and process conditions on the regeneration effect of deactivated catalysts were discussed emphatically. The results show that the regeneration effect of acid washing on the deactivated catalyst is obviously better than that of water washing. Under the conditions of ultrasonic frequency of 30 kHz, HNO3 concentration of 0.3 mol l–1, acid washing for 45 min and calcination at 400°C for 4 h, the removal rate of NO by the catalyst can be recovered from 35 to 89%. Using Brunauer–Emmett–Teller and Barren–Johner–Halendar analysis, X-ray fluorescence analysis, and NH3 temperature-programmed desorption analysis, it was found that acid washing can better restore the specific surface area and surface acid content of the deactivated catalyst, and has a strong ability to remove alkali metal K.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (NSFC 21676145), and Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD, China).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing, 211816, China

    Zihan Qiu, Shuai Zhu & Xia Gui

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  1. Zihan Qiu
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  2. Shuai Zhu
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  3. Xia Gui
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Correspondence to Xia Gui.

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Qiu, Z., Zhu, S. & Gui, X. Regeneration of alkali metal K deactivation in low-temperature manganese-based SCR catalyst. Bull Mater Sci 47, 100 (2024). https://doi.org/10.1007/s12034-024-03151-1

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