Abstract: Transition metal oxides are attractive alternative to noble metals in catalysts for CO removal in virtue of their activity and low cost, but their catalytic performance is significantly degraded in the presence of water. In this work, we demonstrate functional properties of delafossite Ag2CuMnO4-based systems including CO oxidation activity at room temperature under moisture-rich condition. It was established that the variation of the metal ratios during the synthesis of Ag2CuMnO4 does not substantially affect catalytic properties in dry CO oxidation. However, in the presence of water, only oxides with excess silver content proved to be catalytically active for the CO oxidation reaction. The excess silver, localized on the surface of Ag2CuMnO4 particles, was found to involve active oxide-like oxygen on sub-interface boundary promoting wet room-temperature CO oxidation. This process was proposed to proceed via the Mars-van Krevelen mechanism with the participation of active interface oxygen and its recovery through diffusion of the lattice mobile oxygen within delafossite structure. This work provides a good basis for further search and development of active water-resistant catalysts containing relatively inexpensive silver in comparison with Au-, Pd-, Pt-based materials.

Cite: Sokovikov N.A. , Svintsitskiy D.A. , Cherepanova S.V. , Slavinskaya E.M. , Svetlichnyi V.A. , Boronin A.I.
Room Temperature Wet CO Oxidation over Delafossite-based AgOx/Ag2CuMnO4 Catalyst
Applied Surface Science. 2026. V.727. 166019 . DOI: 10.1016/j.apsusc.2026.166019 OpenAlex

Dates:

Submitted:	Nov 23, 2025
Accepted:	Jan 19, 2026
Published online:	Jan 21, 2026
Published print:	May 1, 2026

Identifiers:

OpenAlex:

W7125435382

Citing: Пока нет цитирований

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