XRD was used to Characterize the system of alumina supported ZrO2 in atemperature range of 500-1000℃. It was found that ZrO2 in ZrO2-Al2O3 sample was noncrystalline below 600℃, cubic-ZrO2 over a temperature range of 600-900℃,and t-ZrO2at temperature higher than 900℃. The pore structure, CO oxidation activity and sufaceoxygen properties of out-layer ZrO2 were also studied. The results indicated that smallout-layer ZrO2 made a contribution to pore structure of alumina base in a pore size rangeof 10-50A, and not only was CO oxidation activity of ZrO2-Al2O3 samples related to itsphase structure, but also to properties of its surface oxygen desorption and lattice oxygendefect.
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