Patent ID: 8696787
Filing Date: 2014-04-15
Classification: B22F,B82Y,C22C,Y10S

Abstract:
1. A method for providing a finely divided platinum metal powder, comprising the steps of: a. forming a first paste, comprising a first aqueous mixture of an ammonium or an alkali metal tetrachloroplatinate, hydrochloric acid and a polyethylene glycol hexadecyl ether surfactant; b. forming a second paste comprising a second aqueous mixture of ammonium hydroxide and ascorbic acid and a polyethylene glycol hexadecyl ether surfactant; c. kneading the first and second pastes together on a surface to form a mixed paste; d. forming a liquid suspension of the mixed paste in a heated polar solvent; e. separating the liquid suspension into a precipitated solid and a supernatant; f. recovering the precipitated solid; and g. drying the precipitated solid in a vacuum or an inert atmosphere thereby providing a finely divided powder of platinum metal.