Ce0.5Zr0.4Sn0.1O2/Al2O3 catalysts with enhanced oxygen storage capacity and high CO oxidation activity

Ce0.5Zr0.4Sn0.1O2/Al2O3 catalysts were prepared by a coprecipitation route using Ce(NH4)(2)(NO3)(6), Zr(NO3)(3)center dot 2H(2)O, SnCl4 center dot 5H(2)O and Al2O3 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 degrees 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 Ce0.5Zr0.4Sn0.1O2/gamma-Al2O3 composite possessed excellent thermal stability, enhanced OSC values, and high CO oxidation activity at the low temperatures even after calcination at 1000 degrees C for 20 h.