Unraveling the Structural and Compositional Peculiarities in CTAB-Templated CeO[sub.2]-ZrO[sub.2]-MnO[sub.x] Catalysts for Soot and CO Oxidation

• Published in: Nanomaterials (Basel, Switzerland) Switzerland), 2023-12, Vol.13 (24)
• Main Authors: Grabchenko, Maria V, Mikheeva, Natalia N, Mamontov, Grigory V, Cortés Corberán, Vicente, Litvintseva, Kseniya A, Svetlichnyi, Valery A, Vodyankina, Olga V, Salaev, Mikhail A
• Format: Article
• Language: English
• Subjects: Air pollution; Catalysts; Hazardous substances; Oxidation-reduction reaction
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano13243108

Structure–performance relationships in functional catalysts allow for controlling their performance in a wide range of reaction conditions. Here, the structural and compositional peculiarities in CTAB-templated CeO[sub.2]-ZrO[sub.2]-MnO[sub.x] catalysts prepared by co-precipitation of precursors and their catalytic behavior in CO oxidation and soot combustion are discussed. A complex of physical–chemical methods (low-temperature N[sub.2] sorption, XRD, TPR-H[sub.2], Raman, HR TEM, XPS) is used to elucidate the features of the formation of interphase boundaries, joint phases, and defects in multicomponent oxide systems. The addition of Mn and/or Zr dopant to ceria is shown to improve its performance in both reactions. Binary Ce-Mn catalysts demonstrate enhanced performance closely followed by the ternary oxide catalysts, which is due the formation of several types of active sites, namely, highly dispersed MnO[sub.x] species, oxide–oxide interfaces, and oxygen vacancies that can act individually and/or synergistically.