Combustion methods are popularly used to treat acidic exhaust gases to reduce the emission of pollutants. However, exhaust gas treatment can be difficult and expensive, rendering it essential to develop a new treatment process for acidic exhaust gases. In the present study, we investigated the removal of NO from the HCl–SO₂–NO mixed gas using MnO₂/Mg–Al layered double hydroxide (MnO₂/Mg–Al LDH). We analyzed the influence of CO₂ gas on the NO removal. Additionally, we regenerated MnO₂/Mg–Al LDH after the acid gas adsorption using the wet method and examined the possibility of its cyclical use. MnO₂/Mg–Al LDH could simultaneously remove HCl, SO₂, and NO from the mixed gas. Because HCl and SO₂ influenced the NO removal rate, we proposed a two-step treatment process with MnO₂/Mg–Al LDH and CO₃•Mg–Al LDH to efficiently remove HCl, SO₂, and NO from the HCl–SO₂–NO mixed gas. The NO removal rate decreased with an increase in the CO₂ concentration, confirming the influence of CO₂. Additionally, the results confirmed the possible cyclic use of MnO₂/Mg–Al LDH after removing acid gases. However, the Mn elution and Mn(IV) concentration decreased the removal rates of SO₂ and NO, respectively. Thus, it is necessary to develop the regeneration method further.

燃烧法普遍用于处理酸性废气，以减少污染物的排放。然而，废气处理可能既困难又昂贵，因此必须开发一种新的酸性废气处理工艺。在本研究中，我们研究了使用 MnO ₂ /Mg-Al 层状双氢氧化物 (MnO ₂ /Mg-Al LDH)从 HCl-SO ₂ -NO 混合气体中去除 NO 。我们分析了CO ₂气体对NO去除的影响。此外，我们使用湿法吸附酸性气体后再生了 MnO ₂ /Mg-Al LDH，并检验了其循环使用的可能性。MnO ₂ /Mg-Al LDH 可同时去除 HCl、SO ₂, 和混合气体中的 NO。由于 HCl 和 SO ₂影响 NO 去除率，我们提出了 MnO ₂ /Mg-Al LDH 和 CO ₃ •Mg-Al LDH的两步处理工艺，以有效去除HCl-SO中的 HCl、SO ₂和 NO _2—— NO混合气体。NO去除率随着CO ₂浓度的增加而降低，证实了CO ₂的影响。此外，结果证实了在去除酸性气体后可能循环使用 MnO ₂ /Mg-Al LDH。然而，Mn 洗脱和Mn(IV) 浓度分别降低了SO ₂和NO的去除率。因此，有必要进一步发展再生方法。