Abstract A series of high-entropy mineral catalytic materials were obtained by mixing rare earth tailings containing Fe oxide and rare earth concentrate rich in Ce in Baiyun Obo in different proportions, and by acid-base leaching and microwave roasting. The effects of different proportions of mixed rare earth minerals on the denitrification activity of the samples were analyzed by various techniques, including XRD, EDS and SEM. The mineral phase structure and surface morphology of the catalysts were analyzed. The surface properties of the samples were tested by TPD and XPS methods. The denitrification activity of the sample was simultaneously evaluated and compared in the microreactor. The results show that the denitration efficiency of the active powder is the best when the mixing ratio of rare earth tailings/rare earth concentrate is 1:1, the denitration rate can reach 82%. In summary, different proportions of optimization are extremely effective methods to improve catalyst performance.

中文翻译：

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不同稀土精矿/稀土尾矿配比下高熵矿物催化材料NH3-SCR的对比研究

摘要 在白云鄂博将含Fe氧化物的稀土尾矿与富Ce稀土精矿按不同比例混合，经酸碱浸出和微波焙烧，获得了一系列高熵矿物催化材料。采用XRD、EDS和SEM等多种技术分析了不同比例混合稀土矿物对样品反硝化活性的影响。分析了催化剂的矿物相结构和表面形貌。通过TPD和XPS方法测试样品的表面性能。在微反应器中同时评价和比较样品的反硝化活性。结果表明，当稀土尾矿/稀土精矿混合比为1:1时，活性粉体脱硝效率最佳，脱硝率可达82%。综上所述，不同比例的优化是提高催化剂性能极为有效的方法。