Abstract
Solvothermal synthesis under supercritical conditions (400 °C) and high autogenous pressure (about 40 MPa), has been carriedout for the direct preparation of nanocrystalline powders ofCeO2,Ce0.85Zr0.15O2,Ce0.75Zr0.25O2,Ce0.65Zr0.35O2 andCe0.5Zr0.5O2 which are characterized for applications as catalysts for oxygen storage in automotive catalysis.The synthesis was carried out in the presence of polyethylene glycol and water. For thecharacterization, x-ray diffraction (XRD), transmission electron microscopy (TEM), dynamiclight scattering (DLS) and the Brunauer–Emmet–Teller (BET) technique were employed.The oxygen storage capacity (OSC) of as-prepared and calcined samples without loading ofnoble metals was measured using thermogravimetric–differential thermal analysis (TG–DTA) at600 °C with a continuousflow of CO–N2 gas andair alternately. Ce0.5Zr0.5O2 nanoparticles with a BET surface area of102 m2 g−1 exhibited thehighest OSC of 0.073 50 mol-O2/mol-CeO2. The OSC values obtained increased with increasing the amount ofZrO2 doping in the samples.
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