Thermal stability and oxygen storage capacity of noble metal/ceria-zirconia catalysts for the automotive converters with the on-board-diagnostics (OBD)

Reduction behaviour and oxygen storage capacity (OSC) of Rh-loaded and metal-free Ce0.5Zr0.5O2 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) minimises the differences between the different samples due to the ability of the NM to promote reduction of the Ce0.5Zr0.5O2 by activating hydrogen. © 2000 Elsevier Science B.V. All rights reserved.