Abstract
From the viewpoint of application to catalysis, ultrafine particles have attracted attention as (1) a model material for elucidating the surface characteristics of solid catalysts and (2) an industrial catalyst material suitable for practical use. As a example for the second aspect ultrafine gold particles firmly attached to the surfaces of iron oxide by a coprecipitation method provide an efficient CO oxidation catalyst. Methods to obtain ultrafine particle catalysts are the alkoxide method, the polymer-supported colloid metal method, the metal vapor synthesis method, the mist decomposition method, and the gas evaporation method. Further developments are anticipated on the ground of superiority of the ultrafine particle to the bulky one in the abundance of highly-unsaturated surface sites. As this material is intrisically deficient in thermal stability, the importance of application to endothermic reactions is pointed out.
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