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Porous silicate beads by gelation |
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| Authors: | CJR Gonzlez-Oliver M Schneider K Nawata H Kusano |
| Institution: | Battelle-Europe, Geneva Research Centres, 7, route de Drize, 1227 -, Carouge/Geneva, Switzerland Mitsubishi Chemical Industries, Ltd, 5-2, Marunouchi, 2 Chome, Chiyoda-ku, Tokyo, Japan |
| Abstract: | The sol-gel preparation of porous spherical beads in the system SiO2---ZrO2---TiO2---Al2O3 is described. A uniformly reacted single precursor is dispersed in an aqueous phase and the as-formed droplets are gelled by the addition of NH4OH. After drying, the spheres are subsequently oxidized and partially densified by heat treatments in air. Physico-chemical data indicate that these materials are glassy up to about 650°C and are more resistant to chemical attack than pure silica samples. |
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