Catalytic methane combustion at low temperatures over YSZ-supported metal oxides: Evidence for lattice oxygen participation via the use of C18O2

Catalytic methane combustion was carried out over YSZ, Pd/YSZ and Rh/YSZ between 200 and 700°C. Despite similar light-off curves for Pd/YSZ and Rh/YSZ between 200 and 450°C, isotopic exchange experiments using CD4 and 18 O2 revealed different behaviour of both supported catalysts regarding the activation of reactant molecules. The use of C 18 O2 isotopic gas was shown to be more appropriate than 18 O2 to evaluate the bulk oxygen mobility in YSZ at low temperatures. The exchange of gaseous CO2 with lattice YSZ oxygen atoms, which occurs via surface hydrogen carbonate intermediate species, allowed to demonstrate the contribution of bulk oxygen atoms of YSZ in Rh/YSZ at low temperatures.

Mots clés

Yttria-stabilized zirconia Methane combustion Lattice oxygen Carbon dioxide Isotopic exchange

Domaines

Catalyse Milieux fluides et réactifs

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1-s2.0-S1566736723001061-main.pdf (3.84 Mo)

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https://hal.science/hal-04164468

Soumis le : mardi 18 juillet 2023-13:03:09

Dernière modification le : lundi 11 novembre 2024-07:36:02

Dates et versions

hal-04164468 , version 1 (18-07-2023)

hal-04164468 , version 2 (18-07-2023)

Identifiants

HAL Id : hal-04164468 , version 2
DOI : 10.1016/j.catcom.2023.106704

Citer

Alexandre Nau, Rémy Pointecouteau, Mélissandre Richard, Thomas Belin, Fabien Can, et al.. Catalytic methane combustion at low temperatures over YSZ-supported metal oxides: Evidence for lattice oxygen participation via the use of C18O2. Catalysis Communications, 2023, 180, pp.106704. ⟨10.1016/j.catcom.2023.106704⟩. ⟨hal-04164468v2⟩

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