Abstract
Redox property is an important feature common to all three-way catalysts to eliminate harmful vehicle exhaust. To understand the thermal behavior of redox ability for different ceria-zirconia based materials, five CeO2-ZrO2-Y2O3-La2O3 quaternary mixed oxides (CZ) with varied ratio of Ce/Zr were synthesized. We investigated the changes in redox properties and structures of the as-prepared CZ during thermal aging, together with their relationships. It is found that the Ce-rich CZ samples (Ce/Zr > 1) show a declined OSC after thermal aging, however, an increased OSC is observed in the Zr-rich CZ samples (Ce/Zr ≤ 1). Based on XRD, Raman and XPS analyses, we propose an atom rearrangement mechanism that Zr ions migrate into ceria lattices in the Zr-rich samples during thermal aging accompanied by sintering, accounting for the enhanced OSC, while only sintering occurs in the Ce-rich samples, resulting in deteriorated OSC.
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