Abstract
Incorporation of palladium within the perovskite-type lattice is a valuable strategy to prevent sintering phenomena that reduce the performance of automotive catalysts. However, occupation of B-site coordination sites by Pd can strongly depend on the nature of the perovskite-type oxide and care must be taken for structural interpretation. Pd-based La(B,Pd)O3±δ (B = Mn, Fe, Co) perovskite-type oxides and Y(Fe,Pd)O3±δ have been prepared by the amorphous citrate method by introducing the Pd salt to the precursors solution with the aim to substitute the B-site. The state of Pd was thoroughly characterized using X-ray absorption spectroscopy, X-ray photoelectron spectroscopy, and temperature-programmed reduction with hydrogen. Pd incorporation was achieved for La(Fe,Pd)O3±δ and La(Co,Pd)O3±δ that showed the XANES white line of Pd in octahedral coordination. On the contrary, La(Mn,Pd)O3±δ showed XANES features and reduction behavior typical of segregated PdO particles. The state of Pd in Y(Fe,Pd)O3±δ appeared t...
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