Thermal Stability and Oxygen Storage Capacity of Noble Metal/Ceria-Zirconia Catalysts for the Automotive Converters with the On-Board-Diagnostics (OBD)

摘要

Reduction behaviour and oxygen storae capacity (OSC) of Rh-loaded and emtal-free Ce_(0.5)Zr_(0.5)O_2 mixed oxides is investigated. It is shown that use of different synthetic methods and the homogeneity of the solid solution strongly affect both the reduction behaviour and the total-OSC. Presence of supported noble metal (NM) minimies the differences between the different samples due to the ability of the NM to promote reduction of the Ce_(0.5)Zr_(0.5)O_2 by activating hydrogen.