Реферат: CTAB templated Ce0.8Zr0.2O2 (CZ), MnOx-Ce0.8Zr0.2O2 (Mn-CZ), CeO2 and MnOx oxide catalysts were prepared by precipitation and tested in CO oxidation. Manganese was added to CZ oxide at the precipitation stage (Mn-CZ) or by impregnation of the precipitated CZ oxide with manganese salt (Mn-CZ IM). Despite the decrease in the specific surface area after modification with Mn, both Mn-modified catalysts showed the significant improvement in the catalytic performance. Mn-CZ IM exhibited better catalytic activity than Mn-CZ, which was explained by the different distribution of manganese in CZ found by the complex SEM-EDS, XRD, TPR, Raman spectroscopy, XPS, and EPR study. In Mn-CZ both Mn2+ and Mn3+ ions are incorporated into the CZ lattice and form particles of MnOx phases uniformly distributed over the surface and in the bulk of CZ. In contrast, in Mn-CZ IM no manganese ions are embedded into the crystal lattice of CZ, while the surface of Mn-CZ IM comprises local areas mainly formed by CZ or MnOx. Such arrangement provides the additional adsorption sites and the second redox pair (Mn3+/Mn2+) in addition to Ce3+/Ce4+, improving low-temperature efficiency, whereas the surface areas depleted with MnOx serve as a source of the active oxygen from the CZ lattice, enhancing CO oxidation at high temperatures.

Библиографическая ссылка: Kaplin I.Y. , Lokteva E.S. , Golubina E.V. , Shishova V.V. , Maslakov K.I. , Fionov A.V. , Isaikina O.Y. , Lunin V.V.
Efficiency of manganese modified CTAB-templated ceria-zirconia catalysts in total CO oxidation
Applied Surface Science. 2019. V.485. P.432-440. DOI: 10.1016/j.apsusc.2019.04.206 Scopus OpenAlex

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Scopus:	2-s2.0-85066023136
OpenAlex:	W2940795712

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OpenAlex	34

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