| 摘要 |
An aggregate of silica particles, which has a primary particle size within a nanometer range, is used as a molecular mold (a dispersion medium). A noble metal compound is adsorbed to the nano-silica aggregate with nanometer order distribution and then reduced to a metallic state. Thereafter, silica particles are dissolved. A noble metal porous body produced in this way has a nano-pore structure with a large specific surface area. The nano-pore structure involves nano-pores as traces of silica particles therein, so as to effectively realize intrinsic activity of a noble metal such as Pd, Pt or Rh. The porous noble metal is useful as functional elements, e.g. catalysts, adsorbents, gas-occluding elements and permselective membranes.
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