Process for production of particulate ruthenium

US10913120B2 · kind B2 · utility

Assignee

• HERAEUS DEUTSCHLAND GMBH & CO. KG · DE

Inventors

• Vasco Thiel · Alzenau, DE
• Marco Stemmler · Santa Fe Springs, US
• Hermann Von Eiff · Neuberg, DE
• Christian Kraushaar · Rodenbach, DE
• Jan Roder · Alzenau, DE
• Christoph Röhlich · Hanau, DE

Key dates

• Filing date: Apr 18, 2017
• Grant date: Feb 9, 2021
• Expiry date: Oct 18, 2037

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Process for the production of particulate ruthenium with a purity of ≤99.99 wt. % and a specific surface area of 0.2-0.5 m2/g, comprising: (1) providing a hydrochloric solution prepared by dissolving RuO4 in 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° C. over the course of 0.2-5 hours and while adjusting and maintaining a pH of −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° C.