Interaction of ZrO₂-Al₂O₃ and its Infulence on the Catalytic Performance

XRD was used to Characterize the system of alumina supported ZrO₂ in a temperature range of 500-1000 C. It was found that ZrO₂ in ZrO₂-Al₂O₃ sample was non-crystalline below 600 C. cubic-ZrO₂ in a temperature range of 600-900 C, and t-ZrO₂ at temperature higher than 900 C. The pore structure, CO oxidation activity and suface oxygen properties of out-later ZrO₂ wrer further studide. The results indicated that small out-layer ZrO₂ made a contribution to pore structure of alumina base in a pore site range of 10-50A, and not only was CO oxidation activeity of ZrO₂-Al₂O₃ samples related to its phase structure, but also to properties of its surface oxygen des-orption.