Ce 0.5Zr 0.4Sn 0.1O 2/Al 2O 3 catalysts were prepared by a coprecipitation route using Ce(NH 4) 2(NO 3) 6, Zr(NO 3) 3·2H 2O, SnCl 4· 5H 2O and Al 2O 3 as the starting materials, and were evaluated as a promoter in automotive catalysis by X-ray diffraction, transmission electron microscopy and the Brunauer-Emmet-Teller (BET) technique. The oxygen storage capacity (OSC) values of the samples were measured using thermogravimetric-differential thermal analysis at 600°C with a continuous flow of CO-N 2 gas and air alternately. The CO oxidation activity of the synthesized sample was evaluated via a gas FTIR spectrometer for analysis of gas compositions. The Ce 0.5Zr 0.4Sn 0.1O 2/γ-Al 2O 3 composite possessed excellent thermal stability, enhanced OSC values, and high CO oxidation activity at the low temperatures even after calcination at 1000°C for 20 h.
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