紧密接触条件下MnO、MnO-CeO和CeO催化剂上烟灰氧化的同位素瞬态动力学分析

Rotko Marek, Karpińska-Wlizło Karolina

Department of Chemical Technology, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University, 3 Maria Curie-Skłodowska Square, 20-031 Lublin, Poland.

Molecules. 2025 Jan 16;30(2):343. doi: 10.3390/molecules30020343.

The reaction mechanism of soot oxidation on Mn (MnO), Mn-Ce (MnO-CeO), and Ce (CeO) catalysts in tight contact conditions was investigated using ITKA (isotopic transient kinetic analysis). The obtained results suggest that lattice-bulk oxygen from all studied catalysts takes part in the soot oxidation process but with varying relative contributions: for the Ce catalyst, this contribution is practically 100%, whereas with decreasing Ce content in Mn-Ce catalysts, the significance of lattice-bulk oxygen for soot oxidation diminishes. For the Mn catalyst, it is estimated to be below 50%. Moreover, strong interactions between Mn and Ce ions were observed, increasing oxygen mobility in the catalyst crystal lattice and affecting the activity of Mn-Ce catalysts.

利用ITKA（同位素瞬态动力学分析）研究了紧密接触条件下，烟灰在Mn（MnO）、Mn-Ce（MnO-CeO）和Ce（CeO）催化剂上的氧化反应机理。所得结果表明，所有研究的催化剂中的晶格-体相氧均参与了烟灰氧化过程，但相对贡献各不相同：对于Ce催化剂，这一贡献实际上为100%，而随着Mn-Ce催化剂中Ce含量的降低，晶格-体相氧对烟灰氧化的重要性逐渐减弱。对于Mn催化剂，估计其低于50%。此外，观察到Mn和Ce离子之间存在强烈相互作用，这增加了催化剂晶格中的氧迁移率，并影响了Mn-Ce催化剂的活性。