A new series of Mn-based catalysts (Mn-TiO₂, Ce-Mn-TiO₂, Mn-TiO₂-SO₄^2–, and Ce-Mn-TiO₂-SO₄^2–) were successfully elaborated using the sol–gel method associated with supercritical drying approach for the low-temperature NO-SCR by NH₃. The physicochemical properties of aerogel powders were examined by XRD, N₂-Physisorption at 77 K, NH₃-TPD, H₂-TPR, and DRUV-Vis spectroscopy. It was shown that all the catalysts develop essentially the diffraction peaks of TiO₂ anatase phase and are characterized by a nanometer size (ranging between ~5 and 9 nm), developed mesoporous texture, high surface area (S_BET > 104 m²/g) and large porosity (V_PT > 0.24 cm³/g). The incorporation of Ce and/or SO₄^2– influences differently the structural, textural, acidic, and redox properties of Mn-derived sol–gel catalysts and consequently affects their SCR activity. High NO conversions (>75%) into essentially N₂O are obtained at low temperatures (150–270 °C) over Mn-TiO₂ and Ce-Mn-TiO₂ aerogel systems. The addition of sulfate modifies the nature of Mn species and noticeably reduces the low-temperature reactivity of catalysts (T < 300 °C). However, it induces, thanks to the contribution of many strong acid sites, a substantial increase of the NO conversion into N₂ at higher temperatures (T > 300 °C) leading to highly active and N₂-selective Mn-TiO₂-SO₄^2– and Ce-Mn-TiO₂-SO₄^2– sulfated catalysts. Above 90% NO conversion into N₂ (100%) was reached, in the NO-SCR by NH₃, over the new Ce-Mn-TiO₂-SO₄^2– aerogel catalyst, in the 450–500 °C temperature range.

一系列新的Mn系催化剂（锰的TiO ₂，Ce的锰的TiO ₂，锰的TiO ₂ -SO ₄ ^{2 - ，}和Ce锰的TiO ₂ -SO ₄ ^2-）使用溶胶成功阐述-凝胶法与NH ₃低温NO-SCR的超临界干燥方法相关。通过XRD，77 K下的N _2-物理吸附，NH ₃ -TPD，H ₂ -TPR和DRUV-Vis光谱检查气凝胶粉末的理化性质。结果表明，所有催化剂都基本形成了TiO ₂的衍射峰。锐钛矿相的特征在于纳米尺寸（约5至9 nm），发达的中孔织构，高表面积（S _BET  > 104 m ² / g）和大孔隙率（V _PT  > 0.24 cm ³ / g）。Ce和/或SO ₄ ^2–的掺入对Mn衍生的溶胶－凝胶催化剂的结构，质构，酸性和氧化还原特性产生不同的影响，因此影响其SCR活性。在低温（150–270°C）下，在Mn-TiO ₂和Ce-Mn-TiO ₂上获得高的NO转化率（> 75％），基本上转化为N ₂ O气凝胶系统。硫酸盐的加入改变了锰的性质，并显着降低了催化剂的低温反应性（T  <300°C）。然而，由于许多强酸位点的作用，在较高温度（T  > 300°C）下，NO大量转化为N _2会导致高活性和N _2-选择性Mn-TiO ₂ -SO的转化。₄ ^2–和Ce-Mn-TiO ₂ -SO ₄ ^2–硫酸化催化剂。在新的Ce-Mn-TiO ₂ -SO _4上，NH ₃在NO-SCR中达到90％以上的NO转化为N ₂（100％）。^2-气凝胶催化剂，温度范围为450-500°C。