Preparation of high surface area ZrO2 and ZrO2-Y2O3 from the alkoxide |
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Authors: | A Igarashi H Yamazaki |
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Institution: | (1) Department of Chemical Engineering, Kogakuin University, Nakano-machi, Hachioji-shi, 192 Tokyo, Japan |
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Abstract: | In order to obtain a catalyst support with a high surface area, ZrO2 and ZrO2-Y2O3 were prepared by the hydrolytic decomposition of the corresponding isopropoxide dissolved in benzene. The hydrolysis was carried out at 80°C using an excess amount of distilled water in flowing dry nitrogen. The precipitates thus obtained were dried at 100°C followed by calcination at 500°C in air or nitrogen for 1 h. The specific surface areas for both of the ZrO2 and ZrO2-Y2O3 increased with increasing amount of water added for hydrolysis, and the surface areas for ZrO2-Y2O3 increased with increasing yttrium content. A ZrO2 having a surface area of 130 m2/g was produced, and a stabilized tetragonal ZrO2 with 15 mol% Y3+ having a surface area of 200 m2/g was produced. Furthermore, despite the difference in the ZrO2 and ZrO2-Y2O3 crystal structures, the lattice-strain of ZrO2 has been unequivocally related to the surface area. |
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Keywords: | high surface area zirconia stabilized zirconia zirconium alkoxide hydrolysis lattice-strain |
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