Perovskite BaCeO{sub}3 as a New Redox Host for Catalytic Pd Nanoparticles

摘要

We have examined the ability of a carefully chosen perovskite, BaCeO{sub}3, to act as a redox host for noble metals, notably Pd, in the hope of producing an "intelligent" catalyst where palladium is absorbed into the host lattice as ions under oxidative conditions and released as elemental Pd under reducing conditions. Pd-substituted perovskites BaCe{sub}(1-x)Pd{sub}xO{sub}(3-δ)(0≤x≤0.1) were prepared by solid-state reactions in pure oxygen. The crystal structure was refined in the orthorhombic space group Pnma. Palladium was found to be driven in and out of the perovskite lattice upon repeated redox cycles by detailed XRD study. SEM/EDX revealed the formation of perovskite nanowires and nanorods when reducing Pd-substituted BaCeO{sub}3 up to 1000°C.