Patent ID: 6455594
Filing Date: 2002-09-24
Classification: B01J

Abstract:
A method for producing platinum colloid, comprising:reducing platinum ions by agitating a treatment solution while controlling temperature of said treatment solution under a reductive atmospheric condition, said treatment solution containing one part of capacity of a platinum chloride acid solution, 400 to 500 parts of capacity of water, a non-ion based surface-active agent in an amount of 0.2 to 2 times with respect to an amount of the platinum chloride acid solution, a reducing agent in an amount of 40 to 60 times with respect to the amount of the platinum chloride acid solution, and a pH compensating agent in an amount of 10 to 30 times with respect to the amount of the platinum chloride acid solution if a concentration thereof is 5%, to thereby adjust pH of the treatment solution to neutral or weak alkalinity.