Aluminium doped ceria–zirconia supported palladium-alumina catalyst with high oxygen storage capacity and CO oxidation activity

• A new OSC material of Ce0.5Zr0.3Al0.2O1.9/Pd/γ-Al2O3 is prepared via a mechanochemical method.
• Ce0.5Zr0.3Al0.2O1.9/Pd/γ-Al2O3 showed high OSC even after calcination at 1000 °C for 20 h.
• Ce0.5Zr0.3Al0.2O1.9/Pd/γ-Al2O3 exhibited the highest CO oxidation activity at low temperature correlates with enhanced OSC.

The Ce0.5Zr0.3Al0.2O1.9/Pd-γ-Al2O3 catalyst prepared by a mechanochemical route and calcined at 1000 °C for 20 h in air atmosphere to evaluate the thermal stability. The prepared Ce0.5Zr0.3Al0.2O1.9/Pd-γ-Al2O3 catalyst was characterized for the oxygen storage capacity (OSC) and CO oxidation activity in automotive catalysis. For the characterization, X-ray diffraction, transmission electron microscopy and the Brunauer–Emmet–Teller (BET) technique were employed. The OSC values of all samples were measured at 600 °C using thermogravimetric-differential thermal analysis. Ce0.5Zr0.3Al0.2O1.9/Pd-γ-Al2O3 catalyst calcined at 1000 °C for 20 h with a BET surface area of 41 m2 g−1 exhibited the considerably high OSC of 583 μmol-O g−1 and good OSC performance stability. The same synthesis route was employed for the preparation of the CeO2/Pd-γ-Al2O3 and Ce0.5Zr0.5O2/Pd-γ-Al2O3 for comparison.

Ce0.5Zr0.3Al0.2O1.9/Pd/γ-Al2O3 possessed high OSC and CO oxidation activity at low temperature.Figure optionsDownload as PowerPoint slide