Preparation of Modified UiO-66 Catalyst and Its Catalytic Performance for NH3-SCR Denitration

Zirconium-based metal-organic framework UiO-66 was successfully prepared by solvothermal method, and UiO-66 was modified by adding regulators such as formic acid, acetic acid, and hydrochloric acid. The NH 3 -SCR reactivity of the samples was evaluated by the denitration activity evaluation system,...

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Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2024-04, Vol.39 (2), p.261-267
Main Authors: Wu, Yanxia, Liang, Hailong, Chen, Yufeng, Hu, Liming, Wang, Chunpeng
Format: Article
Language:English
Subjects:
Acetic acid
Advanced Materials
Ammonia
Catalysts
Catalytic activity
Chemistry and Materials Science
Crystal morphology
Denitration
Formic acid
Hydrochloric acid
Low temperature
Materials Science
Metal-organic frameworks
Morphology
Performance tests
Quadrilaterals
Selective catalytic reduction
Zirconium
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Summary:Zirconium-based metal-organic framework UiO-66 was successfully prepared by solvothermal method, and UiO-66 was modified by adding regulators such as formic acid, acetic acid, and hydrochloric acid. The NH 3 -SCR reactivity of the samples was evaluated by the denitration activity evaluation system, and the UiO-66 and the regulator-modified UiO-66 were characterized by XRD, SEM, BET, FTIR, TG, NH 3 -TPD, etc. , the effects of regulator types on the structure and properties of UiO-66 were investigated. The experimental results show that, after adding the modifier, the morphology of UiO-66 changes from irregular quadrilateral with serious agglomeration to particles with regular crystal shape and good dispersibility, and the crystal morphology of the catalyst is improved. In addition, after adding the modifier, UiO-66 has a larger specific surface area and stronger surface acidity, which optimizes the catalytic performance of UiO-66. The catalytic performance test results of NH 3 -SCR show that the low-temperature activity of UiO-66 is poor, and it only shows a certain catalytic activity at higher temperatures. The catalytic activity of UiO-66 was significantly improved after adding the regulator. Among them, the UiO-66-HCl modified with hydrochloric acid had the best catalytic activity, and the denitration rate reached 70% when the denitration temperature was 380 °C.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-024-2879-5