AbstractThe mechanism of carbon combustion over Ag−Pd/alumina catalysts has been studied with the aim of further improving the performance of Ag‐based diesel particulate filter catalysts. Alumina‐supported Ag−Pd, Ag, and Pd catalysts were prepared and compared for their carbon combustion ability. Over the Ag−Pd, Ag, and Pd catalysts, peaks of CO2 emission were observed at 425, 510, and 650 °C, respectively. Details of the catalyst structure and carbon oxidation process were investigated using energy dispersive X‐ray (EDX) mapping and temperature‐dependent Ag and Pd K‐edge X‐ray absorption fine structure analysis during carbon combustion. The EDX mapping and extended X‐ray absorption fine structure analyses suggested that Ag−Pd and PdO particles stacked together in the Ag−Pd/alumina catalyst. With this structure, oxygen atoms could migrate effectively to the Ag−Pd particles from the PdO surfaces, allowing low‐temperature combustion over the Ag−Pd/alumina catalyst.