シリカゲルからのSiO_2-ZrO_2-CaO-Na_2O組成の多孔性微小球状粒子の合成

概要

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Preparation of porous microspheres in the SiO_2-ZrO_2-CaO-Na_2O system was investigated by heating a mixture of fine Na_2CO_3 powder and commercially available, microspherical silica gel impregnated with ZrOCl_2 and CaCl_2, and by subsequently washing the product with water. Porous microspheres, whose surface was composed of sponge-like skeletons were obtained; their pore volume was up to 0.59 cm^3・g^<-1> and the mode pore radius was in the range between 23 and 38 nm. The composition of the porous microspheres was SiO_2-ZrO_2-CaO-Na_2O, which contained ZrO_2 in the range between 11 and 17 mass%. Almost all amounts of Ca and Zr added and a certain amount of Na remained in the porous microspheres. Addition of CaCl_2 resulted in a more homogeneous distribution of ZrO_2 and an increase in resistance to alkaline solution, compared to those of the microspheres prepared by the same procedure without CaCl_2 addition.
2001-12-01