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 NH₃-SCR (Selective catalytic reduction) activity. In this paper, a variety of characterization means like SEM, XRD, BET, XPS, H₂-TPR (Temperature-programmed reduction), NH₃-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 NH₃-SCR activity of rare earth mineral can be improved by loading transition metals (Fe and Mn).

采用混酸体系对稀土矿物表面进行改性后，通过水热法在稀土矿物表面负载两种过渡金属（Fe和Mn），以提高NH ₃ -SCR（选择性催化还原）活性。本文采用SEM、XRD、BET、XPS、H ₂ -TPR（程序升温还原）、NH ₃等多种表征手段-TPD（Temperature-programmed desorption）和NO-TPD用于研究和分析负载过渡金属前后稀土矿物的表面性质。在模拟烟气装置中进一步测量了其催化性能。结果表明负载过渡金属后稀土矿物表面活性元素主要为氧化物。有效提高稀土矿物的比表面积，降低活性物质的结晶度，元素分布更加均匀。此外，稀土矿物表面形成Fe-Ce和Mn-Ce复合结构，矿物表面氧空位和吸附位点明显改善。该NO _XFe负载矿物催化剂在300℃下的转化率达到89.1%。使NO _X为锰加载矿物的催化剂的转化率在250℃时92.3％。一般来说，稀土矿物的NH ₃ -SCR活性可以通过负载过渡金属（Fe和Mn）来提高。