Abstract: CO and CH4 oxidation reactions on Pt/CeO2 catalysts were studied with the aid of experimental kinetic methods of temperature-programmed reactions with CO and CH4 in combination with modeling of the reaction kinetics. The comparison of results obtained for catalysts with low and high Pt content made it possible to differentiate the features of CO and CH4 interaction with different active centers of the catalyst surface, namely, single atoms and PtOx clusters. The presence of PtOx clusters in catalysts leads to the implementation of low-temperature reactions CO + O2 and CH4 + O2. The developed scheme of reactions at the boundary and internal centers of clusters made it possible to explain the implementation of both partial and complete oxidation of methane. When modeling the methane oxidation reaction on PtOx clusters, it was established that the active centers are the boundary centers of clusters modified with OH-groups, which are formed by the dissociation of methane on Pt-O-Ce centers. The experimentally observed increase in the catalytic activity of the methane oxidation reaction in the presence of CO is associated with an additional CO-assisted O2 dissociation mechanism, which is realized only on PtOx cluster centers and not realized on single atom sites.

Cite: Lashina E.A. , Slavinskaya E.M. , Boronin A.I.
CO and CH4 Oxidation Reactions on Pt/CeO2 Catalysts: Experimental Study and Mathematical Modeling
ChemCatChem. 2025. e00616 :1-22. DOI: 10.1002/cctc.202500616 OpenAlex

Dates:

Submitted:	Apr 3, 2025
Accepted:	May 28, 2025
Published online:	Jul 3, 2025

Identifiers:

OpenAlex:

W4412005924

Citing: Пока нет цитирований

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