In order to further improve the low-temperature oxidation performance of NO in flue gas, various manganese loadings supported on γ-Al₂O₃ catalysts were synthesized for NO catalytic oxidation with low O₃/NO ratio of 0.5 at 80–200 °C, the key factors effecting NO conversion and the reaction mechanism were also investigated. Characterization results showed that strong redox behavior, high Mn³⁺/Mn⁴⁺ and abundant chemisorbed oxygen were conducive to catalytic activity, thereby 20%-MnO_x/γ-Al₂O₃ calcined at 500 °C exhibited excellent performance. Meanwhile, there was a clear synergy between 20%-MnO_x/γ-Al₂O₃ and O₃. NO conversion was significantly higher in O₃ system and catalyst + O₃ system than that in catalyst + O₂ system, meanwhile catalyst + O₃ system exhibited higher NO conversion than O₃ system. Besides, NO conversion could be further improved with lower NO initial concentration, about 10% O₂ content and lower GHSV. Both H₂O and SO₂ exerted negligible impact on the catalytic activity of 20%-MnO_x/γ-Al₂O₃, but SO₂ inhibited its catalytic activity irreversibly due to the deposition of S-species on the catalyst surface. According to the in-situ DRIFTS analysis, the intermediate by-products and their changes during the NO adsorption were recorded. Furthermore, a possible reaction mechanism of NO catalytic oxidation with O₃ was proposed.

为了进一步提高烟气中NO的低温氧化性能，合成了负载在γ-Al ₂ O ₃催化剂上的各种锰负载物，用于在80-200°C下O ₃ /NO比为0.5的低O ₃ /NO 比值催化氧化，还研究了影响NO转化的关键因素和反应机理。表征结果表明，强氧化还原行为、高Mn ³⁺ /Mn ⁴⁺和丰富的化学吸附氧有利于催化活性，因此20%-MnO _x /γ-Al ₂ O ₃在500℃下煅烧表现出优异的性能。同时，20%-MnO _x /γ-Al之间存在明显的协同作用。₂ O ₃和O ₃。O ₃体系和催化剂+O ₃体系的NO转化率显着高于催化剂+O ₂体系，同时催化剂+O ₃体系的NO转化率高于O ₃体系。此外，降低NO初始浓度、约10%的O ₂含量和降低GHSV可以进一步提高NO转化率。H ₂ O 和 SO ₂对 20%-MnO _x /γ-Al ₂ O ₃的催化活性影响不大，但 SO ₂由于 S 物质在催化剂表面的沉积，不可逆地抑制了其催化活性。根据原位 DRIFTS 分析，记录了 NO 吸附过程中的中间副产物及其变化。此外，提出了NO与O ₃催化氧化的可能反应机理。