eO2-Al2O3复合氧化物的制备与表征

In this paper, the pure CeO2 solid and CeO2-Al2O3 mixed oxide were synthesis by citrate coordination when Ce(NO3)3 and Al(NO3)3 as raw materials, citric acid as precipitation of coordination, Polyethylene glycol as dispersant. And the pure CeO2 solid and CeO2-Al2O3 mixed oxide were characterized by the means of FT-IR, XRD, laser particle size analyzer. Infrared spectral analysis shows that citric acid -nitrate gel is not formed by the condensation reaction, but is formed through the rare-earth ion bridging role and the hydrogen bond between the coordination ions. XRD analysis shows that in the CeO2-Al2O3 mixed oxides roasting at 700℃, with the incorporation of Al2O3 (the quality percentage of CeO2) increases from 5% to 10%, its first grain size decreases from 117nm to 90nm, but they are lower than that of pure CeO2 of 284nm.Laser-size distribution analysis shows that CeO2 solid will reduce its size by the introduction of a small number of Al2O3. besides, with the introduction of Al2O3 increases from 3%, 5% to 10%, the median size D50 decrease from 1.55μm, 1.39μm to 1.24 μm, and they are lower than that of the pure CeO2 of 1.89μm.