Catalyst system and method for the catalytic combustion of ammonia to form nitrogen oxides in a medium-pressure system

US12109553B2 · kind B2 · utility

Assignee

• HERAEUS DEUTSCHLAND GMBH & CO. KG · DE

Inventors

• Willi Boll · Hanau, DE
• Dirk Maier · Hanau, DE

Key dates

• Filing date: Jan 9, 2020
• Grant date: Oct 8, 2024
• Expiry date: Feb 6, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B21/265
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Known catalyst systems for the catalytic combustion of ammonia to form nitrogen oxides consist of a plurality of catalyst gauze layers which are knitted, woven or braided from platinum-based precious metal wire, which form a catalyst package when arranged after one another when viewed in a fresh gas flow direction. In order to provide a catalyst system on this basis for use in a medium-pressure system, with which a yield of the main product NO comparable to the industry standard can be achieved despite the reduced precious metal use, according to the invention, the catalyst package is formed from a front assembly with three catalyst gauzes with a first average mass per unit area and a downstream assembly of catalyst gauze layers arranged after the front assembly and having a second average mass per unit area, wherein the average mass per unit area of the front assembly has a short weight in the region of 1.5% to 29% in relation to the second average mass per unit area, and the first average mass per unit area lies in the regions of 410 to 30 g/m2 and the second average mass per unit area lies in the region of 540 to 790 g/m2.