Alloy colloidal particles, alloy colloidal solution and manufacturing method thereof, and carrier on which alloy colloidal particles are fixed

摘要

Disclosed is an alloy colloidal particle wherein an alloy is formed on the surface of a metal fine particle which alloy contains one or more metals other than the metal fine particle. Also disclosed is an alloy colloidal solution obtained by dispersing such alloy colloidal particles in a solution. Further disclosed is a method for producing an alloy colloidal solution which is characterized by a step of adding a metal salt in a solution containing no oxygen and having reduction proceeds for a certain time and a following step of adding one or more other metal salts and having reduction proceeds further. By this method, alloy colloidal particles and an alloy colloidal solution which are excellent in catalytic activity and easily loaded on a supporting body can be obtained relatively easily.