The impact of Fe/Mn loads on the surface property of rare earth mineral

After using the mixed acid system to modify the surface of rare earth minerals, two transition metals (Fe and Mn) are loaded on the surface of the rare earth minerals by hydrothermal method to improve the NH 3 -SCR (Selective catalytic reduction) activity. In this paper, a variety of characterizatio...

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Bibliographic Details
Published in:Materials research express 2021-08, Vol.8 (8), p.85506
Main Authors: Bai, Yuze, Zhu, JinHao, Luo, HuiJuan, Wang, ZhenFeng, Wu, Wenfei, Zhang, Kai
Format: Article
Language:English
Subjects:
active powder
Ammonia
Catalysts
catalytic activity
Chemical reduction
Composite structures
Conversion
Flue gas
Iron
Manganese
Minerals
NH3-SCR
rare earth Mineral
Selective catalytic reduction
structure–activity relationship
Surface properties
Transition metals
X ray photoelectron spectroscopy
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Summary:After using the mixed acid system to modify the surface of rare earth minerals, two transition metals (Fe and Mn) are loaded on the surface of the rare earth minerals by hydrothermal method to improve the NH 3 -SCR (Selective catalytic reduction) activity. In this paper, a variety of characterization means like SEM, XRD, BET, XPS, H 2 -TPR (Temperature-programmed reduction), NH 3 -TPD (Temperature-programmed desorption) and NO-TPD are used to study and analyze the surface properties of rare earth minerals before and after loading transition metals. Its catalytic performance was further measured in a simulated flue gas installation. The results show that the active elements on the surface of rare earth minerals after loading transition metals are mainly oxides. The specific surface area of rare earth minerals is effectively improved, the crystallinity of the active material is reduced, and the element distribution is more uniform. In addition, a composite structure of Fe-Ce and Mn-Ce is formed on the surface of rare earth minerals, and the oxygen vacancies and adsorption sites on the surface of the minerals are significantly improved. The NO X conversion rate for Fe-loaded mineral catalysts reached 89.1% at 300 ℃. The NO X conversion rate for Mn-loaded mineral catalysts reached 92.3% at 250 ℃. Generally speaking, the NH 3 -SCR activity of rare earth mineral can be improved by loading transition metals (Fe and Mn).
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/abefb2