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

Autor: Alexandre Nau, Rémy Pointecouteau, Mélissandre Richard, Thomas Belin, Fabien Can, Clément Comminges, Nicolas Bion
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Catalysis Communications, Vol 180, Iss , Pp 106704- (2023)
Druh dokumentu: article
ISSN: 1873-3905
97446408
DOI: 10.1016/j.catcom.2023.106704
Popis: 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 18O2 revealed different behaviour of both supported catalysts regarding the activation of reactant molecules. The use of C18O2 isotopic gas was shown to be more appropriate than 18O2 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.
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