The partial substitution of Ce in CeO2 with isovalent elements like Hf and Zr greatly increases the overall activity of methane combustion measured as light-off and ignition temperature; the presence of a defective fluorite-structured oxide is recognized as a key factor in the activity enhancement.
F. Zamar, A. Trovarelli, C. de Leitenburg and G. Dolcetti, J. Chem. Soc., Chem. Commun., 1995, 965 DOI: 10.1039/C39950000965
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