The development of catalysts has seen tremendous growth recently but most strategies only report utilization of catalysts for a few initial cycles without taking into account the influence of oxygen poisoning. Here, the magnetic Fe₃O₄@EDTA-Fe (MEFe, having a core Fe₃O₄ particle with EDTA-Fe coating) was investigated as a model catalyst for long-term recycling for the removal of nitrogen oxide (NO_x) from NO/O₂ mixture, followed by N₂O recovery. The concentration of oxygen in the flue gas was found to have a strong impact on NO_x absorption and catalytic response. To circumvent the oxygen poisoning, the MEFe was subjected to electrochemical treatment in the presence of neutral red (N.R.) and NO removal efficiency was ∼95% noted. Furthermore, the surface of the catalyst degraded significantly (p < 0.05) after 6-7 repetitive cycling due to surface catalytic reactions, surface poisoning, oxidation of metallic species as well as residual stresses. The MEFe surface was reconstructed after 7 cycles using EDTA solution and Fe source to achieve similar surface coating as the fresh MEFe catalyst. The reconstructed MEFe exhibited similar NO_x absorption capability as the fresh MEFe and the reconstruction loop was repeated several times to achieve long term cycling, which make the catalyst cost-effective. Hence, it is proposed that a successful regeneration process can be employed for promising, sustainable and long-lasting catalytic treatment of air pollutants.

催化剂的发展近来取得了巨大的增长，但是大多数策略仅报告了在几个初始循环中催化剂的使用，而没有考虑到氧气中毒的影响。在此，研究了磁性Fe ₃ O ₄ @ EDTA-Fe（MEFe，具有带EDTA-Fe涂层的核心Fe ₃ O ₄颗粒）作为模型催化剂，用于长期回收以去除氮氧化物（NO _x）从NO / O ₂混合物中，然后用N ₂ O恢复。发现烟气中的氧气浓度对NO _x有强烈影响吸收和催化反应。为了避免氧气中毒，在中性红（NR）存在下对MEFe进行了电化学处理，NO去除效率约为95％。此外，由于表面催化反应，表面中毒，金属物质的氧化以及残余应力，催化剂表面在6-7次重复循环后显着降解（p <0.05）。在7个循环后，使用EDTA溶液和铁源重建MEFe表面，以获得与新鲜MEFe催化剂相似的表面涂层。重建的MEFe表现出相似的NO _x重复几次吸收新鲜的MEFe和重建环的吸收能力，以实现长期循环，从而使催化剂具有成本效益。因此，建议将成功的再生过程用于有希望的，可持续的和持久的空气污染物催化处理。