| 摘要 |
PROBLEM TO BE SOLVED: To deposit a metal in a highly dispersed state on the surfaces of the pore walls of a porous base body with good durability even on a small pore part by dissolving a metal precursor in a supercritical fluid, bringing the obtd. precursor fluid into contact with a porous base body to coat the surfaces of the pore walls, and then heating and calcining. SOLUTION: A metal precursor is dissolved, if necessary by using a solubility controlling agent, in a supercritical fluid of hydrocarbons, alcohols, carbon dioxide or the like. As for the metal precursor, alkoxides, acetylacetate, org. acid salts, nitrates, chlorides and oxychlorides of metals can be used. The obtd. precursor fluid is brought into contact with a porous base body 11 having lots of pores 10 on the surface such as activated carbon, metals and metal oxides. The fluid containing the supercritical fluid as a solvent having similar diffusion property and viscosity to those of a gas is easily and rapidly permeates through the micropores to coat the surfaces 111 of the pore walls. Then the porous base body 11 is heated and calcined to decompose the metal precursor to obtain a metal carrying body 1 having Pt metal 3.
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