CeO₂ is an important porous material with a wide range of applications in the abatement of volatile organic compounds (VOCs). In this paper, we prepared a series of novel three-dimensional (3D) micro/nanostructured CeO₂ materials via a solvothermal method. Organic acid-assisted synthesis and inorganic acid post-treatment were used to adjust the CeO₂ microstructures. The size of the 3D micro/nanostructures could be controlled in the range from 180 nm to 1.5 μm and the surface morphology changed from rough to smooth with the use of different organic acids. The CeO₂ synthesized with acetic acid featured a hierarchical porosity and showed good performance for toluene catalytic combustion: a T₅₀ of 187 °C and a T₉₀ of 195 °C. Moreover, the crystallite size, textural properties, and surface chemical states could be tuned by inorganic acid modification. After treatment with HNO₃, the modified CeO₂ materials exhibited improved catalytic activity, with a T₅₀ of ∼175 °C and a T₉₀ of ∼187 °C. We concluded that the toluene combustion activity is related to the porosity and the amount of surface active oxygen of the CeO₂. Both these features can be tuned by the co-work of organic and inorganic acids.

CeO ₂是一种重要的多孔材料，在减少挥发性有机化合物（VOC）方面具有广泛的应用。在本文中，我们通过溶剂热法制备了一系列新颖的三维（3D）微米/纳米结构CeO ₂材料。用有机酸辅助合成和无机酸后处理来调节CeO _2的微观结构。3D微米/纳米结构的尺寸可以控制在180 nm至1.5μm的范围内，并且使用不同的有机酸可使表面形态从粗糙变为光滑。用乙酸合成的CeO ₂具有分级的孔隙率，并表现出良好的甲苯催化燃烧性能：T ₅₀187℃的T ₉₀和195℃的T ₉₀。此外，可以通过无机酸改性来调节微晶尺寸，组织性质和表面化学状态。用HNO ₃处理后，改性的CeO ₂材料表现出改善的催化活性，T ₅₀为约175°C，T ₉₀为约187°C。我们得出的结论是，甲苯的燃烧活性与CeO ₂的孔隙率和表面活性氧的数量有关。这两个特征都可以通过有机酸和无机酸的共同作用来调节。