申请人:SAGA PREFECTURE
公开号:EP0479553A1
公开(公告)日:1992-04-08
Porous ceramics having high porosity and a narrow pore size distribution are obtained by preparing a dilute slurry by mixing a ceramic raw material with a solution of such an organic high-molecular compound as ammonium alginate, which is capable of being gelled by reaction with an acid or a di- or more-valent cation, or by being heated or cooled. The slurry is contacted with a liquid or gel in which the acid or a di- or more-valent cation is present, or is heated or cooled to obtain a green ceramic gel body, and the obtained body fired. A hybrid porous ceramic is obtained if the slurry contains a di- or more-valent cation compound as a gelling agent. The porous ceramics have improved resistance and mechanical strength, typically compression strength, and a narrower pore size distribution, thus being suitable as catalyst carriers for high-temperature purposes or as carriers for bioreactors.
将陶瓷原料与海藻酸铵等有机高分子化合物溶液混合,制备成稀浆料,通过与酸或二价或多价阳离子反应,或通过加热或冷却,可使海藻酸铵等有机高分子化合物凝胶化,从而获得具有高孔隙率和窄孔径分布的多孔陶瓷。将浆料与含有酸或二价或多价阳离子的液体或凝胶接触,或加热或冷却,以获得绿色陶瓷凝胶体,并对获得的凝胶体进行烧制。如果浆料中含有作为胶凝剂的二价或多价阳离子化合物,则可获得混合多孔陶瓷。这种多孔陶瓷具有更好的耐受性和机械强度(通常是压缩强度),孔径分布更窄,因此适合用作高温催化剂载体或生物反应器的载体。