Of platinum and platinum alloy of high surface area and low chlorine content powders and processes for preparing these powders

摘要

The present invention uniformly finely divided particle size, a process for preparing a powder of platinum or platinum alloy to produce a metal powder having a large surface area and a low chlorine content, as well as platinum or a platinum alloy is prepared by the process provision of powder. A process for forming an alkali metal nitrate, the melt containing a low-melting mixture of compounds of alloying elements without the platinum compound and the chlorine containing no chlorine; the melt, of the platinum compound and the alloying elements a step of heating to the reaction temperature the compound gives a thermally decomposed to the oxide; step for cooling the me melt comprising the steps of dissolving in water, oxides or mixed oxides formed are, by subsequent reductive process comprising steps a, that is converted into a powder of platinum or platinum alloy. 40m ² / g and has a large BET specific surface area than, comprising a powder having a chlorine content of less than 100ppm, powder of platinum or platinum alloy. .BACKGROUND