Thermally stable CeO₂ cubes and nanospheres were synthesized and modified by sulfation treatment. Non-sulfated CeO₂ cubes and nanospheres did not exhibit good catalytic performance for selective catalytic reduction of NO_x with NH₃ (NH₃-SCR), but mainly contributed towards an undesired side reaction of NH₃ oxidation above 350 °C. Based on the structural, morphological and physicochemical characterization, it was observed that CeO₂ nanospheres comprising small crystallites could easily release active oxygen species, which resulted in strong NH₃ oxidation. However, sulfation treatment greatly improved the catalytic performance of NH₃-SCR on both CeO₂ cubes and nanospheres. Sulfated CeO₂ catalysts did not contribute to significant NH₃ oxidation due to the inhibited reducibility of Ce⁴⁺ coordinated with the surface sulfates. The adsorbed ammonia could be activated on Brønsted acid sites generated by the formation of surface Ce₂(SO₄)₃ species, while gaseous NO_x could be activated on separate surface sites of Ce⁴⁺. The presence of separate reaction sites for NH₃ and NO_x is believed to be important for the improved catalytic performance of SCR reaction. Sulfated CeO₂ cubes outperformed sulfated CeO₂ nanospheres in the entire test temperature window (200–500 °C). The improved performance of sulfated CeO₂ cubes appears to be related to surfaces with abundant Brønsted acid sites and relatively weak reducibility of Ce⁴⁺. These fundamental findings contribute to a better mechanistic understanding needed for designing efficient CeO₂-based NO_x reduction catalysts in the future.

通过硫化处理合成并改性了热稳定的CeO ₂立方体和纳米球。非硫酸化的CeO _2米的立方体，纳米球没有表现出用于选择性催化还原的良好催化性能NO _X与NH ₃（NH ₃ -SCR），但主要是朝向贡献NH的不希望的副反应₃高于350℃氧化。基于结构，形态和物理化学特征，观察到包含小微晶的CeO ₂纳米球可以轻松释放活性氧，从而导致强烈的NH ₃氧化。但是，硫酸化处理大大提高了NH的催化性能。CeO ₂立方体和纳米球上的₃ -SCR 。硫酸化的CeO ₂催化剂没有抑制明显的NH ₃氧化，因为与表面硫酸盐配位的Ce ^4+的还原性受到抑制。吸附的氨可以在由铈的形成面的产生布朗斯台德酸位点被激活₂（SO ₄）₃种，而气态的NO _X可以在铈的单独的表面位点被激活⁴⁺。NH ₃和NO _x的单独反应位点的存在被认为对于改善SCR反应的催化性能是重要的。硫酸铈在整个测试温度窗口（200–500°C）中，有₂个立方体的性能优于硫酸CeO ₂纳米球。硫酸化的CeO ₂立方体的性能改善似乎与具有丰富的布朗斯台德酸位和相对较弱的Ce ⁴⁺还原性的表面有关。这些基本发现有助于需要设计高效的总裁开了个更好的机制理解₂为基础的NO _X还原催化剂的未来。