The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 09, 2021
Filed:
Apr. 18, 2017
Heraeus Deutschland Gmbh & Co. KG, Hanau, DE;
Vasco Thiel, Alzenau, DE;
Marco Stemmler, Mömbris, DE;
Hermann Von Eiff, Neuberg, DE;
Christian Kraushaar, Rodenbach, DE;
Jan Roder, Freigericht, DE;
Christoph Rohlich, Hanau, DE;
HERAEUS DEUTSCHLAND GMBH & CO. KG, Hanau, DE;
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 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° 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.