	US 12,109,553 B2
	Catalyst system and method for the catalytic combustion of ammonia to form nitrogen oxides in a medium-pressure system
Willi Boll, Hanau (DE); and Dirk Maier, Hanau (DE)
Assigned to Heraeus Deutschland Gmbh & Co KG, Hanau (DE)
Appl. No. 17/309,893
Filed by Heraeus Deutschland Gmbh & Co. KG, Hanau (DE)
PCT Filed Jan. 9, 2020, PCT No. PCT/EP2020/050377 § 371(c)(1), (2) Date Jun. 28, 2021, PCT Pub. No. WO2020/148144, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 19151608 (EP), filed on Jan. 14, 2019.
Prior Publication US 2022/0080396 A1, Mar. 17, 2022
Int. Cl. B01J 23/42 (2006.01); B01J 23/44 (2006.01); B01J 23/46 (2006.01); B01J 35/06 (2006.01); B01J 35/58 (2024.01); C01B 21/26 (2006.01); C01B 21/38 (2006.01)

CPC B01J 23/464 (2013.01) [B01J 35/58 (2024.01); C01B 21/38 (2013.01); C01B 21/265 (2013.01)]

16 Claims

1. A catalyst system for the catalytic combustion of ammonia to form nitrogen oxides in a medium-pressure plant, having a plurality of catalyst gauze layers weft-knitted, woven or warp-knitted from platinum-based noble metal wire, which, when arranged one behind the other in a fresh gas flow direction, form a catalyst pack, wherein the catalyst pack is formed from a front assembly with three catalyst gauzes having a first average weight per unit area, and a downstream assembly of catalyst gauze layers arranged after the front assembly, having a second average weight per unit area, wherein the average weight per unit area of the front assembly has a weight reduction ranging from 1.5% to 29% relative to the second average weight per unit area, and in that the first average weight per unit area is in the range of 410 to 530 g/m²and the second average weight per unit area is in the range of 540 to 790 g/m².