New mesoporous and well-structured aerogel catalysts (CeO₂–TiO₂, WO₃–TiO₂ and WO₃–CeO₂–TiO₂) were elaborated via the sol–gel method, characterized by means of various techniques (XRD; N₂-Physisorption at 77 K; NH₃-TPD; H₂-TPR; DRUV–Vis spectroscopy) and evaluated in the selective catalytic reduction (SCR) of NO by NH₃. The results reveal that all the aerogel catalysts develop essentially the diffraction peaks of TiO₂ anatase phase and are classified as mesoporous materials with a high surface area (70 < S_BET < 106 m² g⁻¹), large porosity (0.27 < V_PT < 0.46 cm³ g⁻¹) and nanometer size of crystallites (8–15 nm). The addition of Ce and/or W influences differently the structure, texture, crystallites size, surface oxygen concentration, total acidity and redox ability of aerogel samples and clearly affects their NO-SCR activity which follows this order: TiO₂ < WO₃–TiO₂ < CeO₂–TiO₂ < WO₃–CeO₂–TiO₂. It was also found that cerium species are more active in the low temperature NO-SCR reaction than tungsten ones (NO conversions obtained at 300 °C using CeO₂–TiO₂ and WO₃–TiO₂ were 75 and 0%, respectively). On the other hand, it was suggested that the interactions between Ce and W species play a key role in improving the reactivity of WO₃–CeO₂–TiO₂ catalyst in the SCR of NO by NH₃. Interestingly, the NO conversion into N₂ reaches 85% at 300 °C and exceeds 90% between 320 and 400 °C over this novel meso-structured aerogel catalyst.

新型介孔和结构良好的气凝胶催化剂（CeO ₂ –TiO ₂、WO ₃ –TiO ₂和WO ₃ –CeO ₂ –TiO ₂）是通过溶胶-凝胶法精心制作的，并通过各种技术（XRD；N ₂ - 77 K 下的物理吸附；NH ₃ -TPD；H ₂ -TPR；DRUV-Vis 光谱）并在 NH ₃对 NO 的选择性催化还原 (SCR) 中进行评估。结果表明，所有气凝胶催化剂基本上都形成了TiO ₂锐钛矿相的衍射峰，属于高表面积（70 < S _BET）的介孔材料。< 106 m ² g ^-1）、大孔隙率（0.27 < V _PT < 0.46 cm ³ g ^-1）和纳米尺寸的微晶（8-15 nm）。Ce和/或W的添加对气凝胶样品的结构、质地、微晶尺寸、表面氧浓度、总酸度和氧化还原能力有不同的影响，并且明显影响其NO-SCR活性，其顺序如下：TiO ₂ < WO ₃ –TiO ₂ < CeO ₂ –TiO ₂ < WO ₃ –CeO ₂ –TiO ₂. 还发现铈物质在低温 NO-SCR 反应中比钨物质更活跃（在 300°C 下使用 CeO ₂ -TiO ₂和 WO ₃ -TiO ₂获得的 NO 转化率分别为 75% 和 0%）。另一方面，有人提出，Ce 和 W 物种之间的相互作用在提高 WO ₃ -CeO ₂ -TiO ₂催化剂在 NH ₃的 NO SCR 中的反应性方面起着关键作用。有趣的是，在这种新型介观结构气凝胶催化剂上，NO 转化为 N _{2 的}转化率在 300 °C 下达到 85%，在 320 到 400 °C 之间超过 90%。