Elimination of soot particles from diesel exhaust remains one of the most pressing environmental issues. During the NO_x-assisted soot catalytic oxidation process, it is proposed that the enhanced adsorption of NO_x species (including NO and NO₂) on the catalyst plays an important role in soot combustion. In this work, the 3DOM mullite catalysts with distinct NO_x adsorption properties were designed, and the effect of NO_x adsorption intensity on soot combustion behavior was investigated. It is proven that the soot combustion activity of 3DOM SmMn₂O₅ (SMO) catalyst was greatly improved when the adsorption of NO_x on the catalyst was strengthened by the modification of K₂Mn₄O₈ (KMO). Among all the as-prepared catalysts, the 5% KMO-SMO catalyst stands out with the best performance with the T₁₀, T₅₀, T₉₀ and S_CO2 of 299 °C, 336 °C, 383 °C and 99%, which represents one of the best catalysts for soot combustion application. Besides, our reaction mechanism analysis illustrates the importance of balancing the NO_x adsorption and NO oxidation on modified SMO catalyst for NO_x-assisted soot combustion reaction.

消除柴油机废气中的烟尘颗粒仍然是最紧迫的环境问题之一。提出了在NO _x辅助的烟灰催化氧化过程中，NO _x种类（包括NO和NO ₂）在催化剂上的增强吸附在烟灰燃烧中起重要作用。在这项工作中，具有鲜明的NO 3DOM莫来石催化剂_X吸附性能进行了设计，和NO的作用_X上烟灰燃烧行为吸附强度进行了研究。事实证明，当吸附NO _x时，3DOM SmMn ₂ O ₅（SMO）催化剂的烟灰燃烧活性得到了极大的改善。通过改性K ₂ Mn ₄ O ₈（KMO）增强了催化剂的表面活性。在所有制备的催化剂中，5％的KMO-SMO催化剂以299°C，336°C，383°C和99％的T ₁₀，T ₅₀，T ₉₀和S _CO2的最佳性能脱颖而出。它代表了烟尘燃烧应用的最佳催化剂之一。此外，我们的反应机理分析示出了平衡NO的重要性_X吸附和NO氧化改性SMO催化剂NO _X -assisted烟灰燃烧反应。