Method for oxidizing ammonia and system suitable therefor

US10414654B2 · kind B2 · utility

Assignee

• THYSSENKRUPP INDUSTRIAL SOLUTIONS AG · DE

Inventors

• Meinhard Schwefer · Meschede, DE
• Rolf Siefert · Rheda-Wiedenbrück, DE
• Klaus Ruthardt · Dortmund, DE
• Alberto Cremona · Fiorenzuola d'Arda, IT
• Edoardo Vogna · Novara, IT

Key dates

• Filing date: Mar 13, 2014
• Grant date: Sep 17, 2019
• Expiry date: Sep 12, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2002/34
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A system suitable for oxidizing ammonia with oxygen in the presence of catalysts is described. The system includes a reactor equipped with at least one supply line for a reactant gas mixture and at least one discharge line for a process gas; a catalyst comprising at least one transition metal oxide that is not an oxide of a platinum metal; and a device for adjusting a molar ratio of oxygen to ammonia of less than or equal to 1.75 mol/mol in the reactant gas mixture by mixing an oxygen-containing gas stream having an O2 content of <20% by volume with a chosen amount of ammonia. The oxygen-containing gas stream is produced by a device for: diluting an air stream with a gas stream comprising less than 20% by volume oxygen; or depleting oxygen from an oxygen-containing gas mixture, preferably from air; or by a combination thereof.