| 摘要 |
PURPOSE:To produce porous zirconia spheres useful as a high functional material, e.g. sensor, catalyst, by dispersing a solution of Zr alkoxide containing a Ca- or Y alkoxide added thereto in an organic solvent in specific formamide. CONSTITUTION:10-30mol Ca alkoxide, e.g. Ca methoxide, or 4-16mol Y alkoxide, e.g. Y methoxide, based on 1mol Zr alkoxide is dissolved in a solution containing 0.1-2.0mol/l Zr alkoxide, e.g. Zr methoxide, in an organic solvent to provide a raw material solution, which is then dispersed in formamide containing a small amount of aqueous ammonia and/or succinic acid in the form of fine droplets and heated at a temperature (60-70 deg.C) below the boiling point of the solvent for 5-30min and form solidified spherical particles. The resultant spherical particles are subsequently dried and calcined at 1,200-1,500 deg.C to afford porous zirconia having 50-100mu diameter and porous internal structure.
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