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|Title:||High surface area zirconia by digestion of zirconium propoxide at different pH|
|Authors:||Chuah, G.K. |
High surface area zirconia
|Source:||Chuah, G.K., Liu, S.H., Jaenicke, S., Li, J. (2000-09). High surface area zirconia by digestion of zirconium propoxide at different pH. Microporous and Mesoporous Materials 39 (1-2) : 381-392. ScholarBank@NUS Repository. https://doi.org/10.1016/S1387-1811(00)00189-X|
|Abstract:||The microstructure of hydrous zirconia (ZrO2) prepared by the hydrolysis of zirconium propoxide followed by digestion at pH 1, 3 and 9 and the ZrO2 derived from this precursor have been studied. The undigested hydrous oxides formed plate-like aggregates with low porosity. After digestion at pH 9, the hydrous oxides became highly porous with surface areas up to 550 m2/g. Calcination at 500°C for 12 h results in ZrO2 with surface areas of more than 380 m2/g. ZrO2 formed after digestion in acidic medium had lower surface areas of less than 100 m2/g and were mixed in tetragonal and monoclinic phases. The water/propoxide ratio during gel formation influences the surface area of the resulting ZrO2. The thermal stability of the material is remarkable: ZrO2 resulting from long digestion retained up to 100 m2/g after successive heating to 900°C. The observed microstructural properties are attributed to the nature of the alkoxide precursor formed under different water/alkoxide ratios and to the effects of digestion under varying pH conditions. (C) 2000 Elsevier Science B.V. All rights reserved.|
|Source Title:||Microporous and Mesoporous Materials|
|Appears in Collections:||Staff Publications|
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