Research progress of MnO_x-, FeO_x- and CuO_x-based core-shell catalysts in NH₃-SCR denitrification

To improve the low-temperature activity and poisoning resistance of ammonia selective catalytic reduction （NH₃-SCR） denitrification catalysts, this review summarizes recent progress in the development of MnO_x-, FeO_x-, and CuO_x-based core-shell catalysts. By systematically examining design strategies for core-shell architectures, we emphasize the role of the shell layer in protecting active sites, tuning redox properties, and enhancing interfacial synergy. The findings reveal that the performance enhancement stems mainly from the suppression of sulfate deposition, effective generation of oxygen vacancies, and rational modulation of surface acidity enabled by the shell structure. The introduction of a core-shell configuration significantly promotes low-temperature catalytic activity, widens the operating temperature window, and improves resistance to H₂O and SO₂. The core-shell structure is recognized as an effective strategy for constructing high-performance SCR catalysts. However, challenges such as complex synthesis procedures and insufficient long-term anti-poisoning stability still persist. This work offers a theoretical basis and technical reference for the further development of high-performance core-shell catalysts.