Heraeus Deutschland Gmbh & Co Kg

Jan Roder

Vasco Thiel

Christoph Röhlich

Hermann Von Eiff

Marco Stemmler

Christian Kraushaar

Process for the production of particulate ruthenium with a purity of &#x2264;99.99 wt. % and a specific surface area of 0.2-0.5 m/g, comprising: (1) providing a hydrochloric solution prepared by dissolving RuOin hydrochloric acid and has a content of ruthenium in the form of dissolved ruthenium species of 15-22 wt. %; (2) providing an aqueous solution with an ammonium chloride content of 200-600 g/litre; (3) forming a reaction mixture by dosing the hydrochloric solution provided in step (1) to the aqueous solution provided in step (2) at a molar ratio of 1 mol ruthenium: 3-6 mol ammonium chloride, at a temperature of 55-90&#xb0; C. over the course of 0.2-5 hours and while adjusting and maintaining a pH of &#x2212;0.6 to 0; (4) separating solid material formed during step (3) from the hydrochloric reaction mixture; and (5) calcinating the solid material separated in step (4) at an object temperature of 350-1,000&#xb0; C.

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Freigericht, Germany

Jan Roder