ALUMINA SILICA COMPOUND, ITS PRODUCTION AND OXYGEN-CONCENTRATION METER, OXYGEN-PURIFICATION APPARATUS AND FUEL CELL UTILIZING THE COMPOUND

摘要

PURPOSE:To obtain an unprecedented amorphous or crystalline alumina silica at a relatively low temperature with extremely simple operation by preparing a sol of an Al salt and an Si alkoxide, drying the sol to form a gel and heat- treating the gel. CONSTITUTION:A sol is prepared by adding water, a solvent or further an acid to an Al salt and an Si alkoxide. The sol is dried and the resultant gel is heat-treated to obtain an amorphous or crystalline alumina silica of formula xAl2O3. (100-x)SiO2 (x is 0-100). An amorphous material is produced at a low temperature and a crystalline one is formed at a high temperature. A coordination compound of sol state can be formed in any forms and an alumina silica having various forms such as powder, block or film can be produced by this process. The alumina silica is utilizable in an oxygen-concentration meter, oxygen-purification apparatus, fuel cell, etc.