Rod-Like Nanoporous CeO2 Modified by PdO Nanoparticles for CO Oxidation and Methane Combustion with High Catalytic Activity and Water Resistance

Table 2 Ratios of Ce, Pd, and O in different states for different catalysts, as obtained from the XPS results

Catalysts	Ce³⁺/(Ce³⁺ + Ce⁴⁺) (%)	Pd²⁺/(Pd⁰ + Pd²⁺) (%)	O_sur/(O_lat + O_sur + O_H2O) (%)
Calcined dealloyed Al₉₂Ce₈	14.27	/	/
Calcined dealloyed Al_91.3Ce₈Pd_0.7	23.33	91.25	29.3
Dealloyed Al_91.3Ce₈Pd_0.7	21.15	6.45	16.2