| 摘要 |
PROBLEM TO BE SOLVED: To provide a catalyst support material having excellent heat resistance and keeping high specific surface area even when being used under a high temperature atmosphere for a long period of time by controlling the size of particles to have a desired optimum size. SOLUTION: After an aqueous precipitate solution formed by a chemical reaction is aged, a step for making a raw material to become the source of particle growth, which is a particle having the same composition and smaller particle diameter, coexist and be subjected to aging again, and the step is repeated to grow the particle constituting the precipitate to have the desired particle size. COPYRIGHT: (C)2008,JPO&INPIT
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