Thermally Induced Structural Evolution of Palladium‐Ceria Catalysts. Implication for CO Oxidation

Structural transformations in Pd/CeO 2 catalysts during their calcination over a wide temperature range (450‐1200 °C) were studied with structural, spectroscopic, and kinetic methods (XRD, TEM, XPS, and TPR). Two synthetic methods were applied: coprecipitation and incipient wetness impregnation. The impregnation synthesis produced the best low‐temperature oxidation of CO (LTO CO) for the catalysts that were calcined at 450–900 °C. Their high LTO CO activities could be attributed to the formation of reactive surface clusters at the PdO−CeO 2 interface. The coprecipitation synthesis produced a homogeneous Pd x Ce 1‐x O 2‐δ solid solution with no Pd nanostructured particles. Decomposition of the solid solution phase occurred at 800–850 °C and resulted in the formation of unusual Pd species, i. e ., Pd(Ce)O x superstructures and agglomerates consisting of 2 nm PdO particles. Further calcination of the catalysts resulted in the formation of mixed Pd 0 −PdO−CeO 2 nanoparticles with a heterophase morphology that provided high thermal stability. These catalysts demonstrated capability for CO oxidation at temperatures below 100 °C after calcination at 1200 °C.