Abstract To research the roles of rare earth minerals in denitrification via the NH3-SCR, a mixture was made by certain ratio of rare earth concentrates and rare earth tailings, then treated by microwave roasting, and acids and bases to form a denitrification catalyst. The mineral phase structure and surface morphology of the catalyst were characterized by XRD, BET, SEM and EDS. The surface properties of the catalyst were tested by TPD and XPS methods, and the denitrification activity of the catalyst was evaluated in a denitrification reactor. The results showed that the denitrification efficiency increased up to 82% with complete processing. XRD, BET, SEM, and EDS spectrum analysis stated that the treated minerals contained cerium oxides and Fe−Ce composite oxides. The surface of the modified minerals became rough and porous, the surface area increased, and the surface-active sites were exposed. The results of NH3-TPD and NO-TPD showed that the catalyst surface could gradually adsorb more NH3 and NO after each step. XPS analysis indicated that there were more Ce3+, Fe2+, and lattice oxygen in rare earth minerals catalyst after each treatment step.

中文翻译：

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制备由稀土矿物组成的催化剂以通过 NH3-SCR 脱硝

摘要 为研究稀土矿物在NH3-SCR脱硝中的作用，将稀土精矿与稀土尾矿按一定比例混合，经微波焙烧、酸碱处理，形成脱硝催化剂。通过XRD、BET、SEM和EDS对催化剂的矿物相结构和表面形貌进行表征。采用TPD和XPS方法测试了催化剂的表面性能，并在反硝化反应器中评价了催化剂的脱硝活性。结果表明，处理完成后，反硝化效率提高了82%。XRD、BET、SEM 和 EDS 光谱分析表明，处理后的矿物含有氧化铈和 Fe-Ce 复合氧化物。改性矿物的表面变得粗糙和多孔，表面积增加，表面活性位点暴露。NH3-TPD和NO-TPD的结果表明，催化剂表面在每一步后都能逐渐吸附更多的NH3和NO。XPS 分析表明，经过每个处理步骤后，稀土矿物催化剂中含有更多的 Ce3+、Fe2+ 和晶格氧。