Abstract: A new laser vaporization (LAVA) method for the synthesis of CeO2 nanoparticles, allowed the synthesis of support samples with widely variable surface area and particle sizes. The LAVA-synthesized CeO2 nanoparticles exhibit a high degree of crystallinity, characterized by the absence of intracrystalline porosity, but high surface defectiveness and a well-developed interblock structure. Platinum deposition produces highly dispersed species, including isolated ions (single atoms Pt2+-SA), ion associates (2D-PtOx rafts), and oxidized 3D-PtOx clusters. The catalyst with the largest surface area and the smallest mean particle size of CeO2 contains platinum mainly in the Pt2+-SA form, owing to its strongest chemical interaction with the surface of small-sized nanoparticles. This highly dispersed catalyst does not exhibit low-temperature activity in CO oxidation, since ignition of the reaction is only observed at T > 150 °C. The catalysts with reduced surface area contain both Pt2+-SA and 3D-PtOx clusters located at extended surface defects and along interblock boundaries. The formation of 3D-PtOx cluster species results in a significant enhancement of the catalytic activity. The most notable catalytic effect is observed for the lowest surface area catalysts, for which CO conversion shows low-temperature activity with the reaction ignition occurring at sub-zero temperatures.

Cite: Stonkus O.A. , Slavinskaya E.M. , Kibis L.S. , Kardash T.Y. , Svetlichnyi V.A. , Stadnichenko A.I. , Lashina E.A. , Kostyukov A.I. , Snytnikov V.N. , Romanenko A.V. , Boronin A.I.
Pt/CeO2 Catalysts Prepared by Laser Vaporization: Morphology, Structure, Platinum State, and Catalytic Properties in CO Oxidation Reaction
ChemCatChem. 2025. e01107 :1-20. DOI: 10.1002/cctc.202501107 WOS Scopus OpenAlex

Dates:

Submitted:	Jul 8, 2025
Accepted:	Sep 30, 2025
Published online:	Oct 30, 2025

Identifiers:

Web of science:	WOS:001611288100001
Scopus:	2-s2.0-105021363984
OpenAlex:	W7104511902

Citing: Пока нет цитирований

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