US 12,220,689 B2
Process for producing catalysts for ammonia synthesis by reducing iron oxides
Rene Eckert, Bad Aibling (DE); Stephan J. Reitmeier, Kirchseeon (DE); and Stefan Maier, Grafing (DE)
Assigned to CLARIANT INTERNATIONAL LTD, Muttenz (CH)
Appl. No. 17/625,819
Filed by Clariant International Ltd, Muttenz (CH)
PCT Filed Jul. 8, 2020, PCT No. PCT/EP2020/069218
§ 371(c)(1), (2) Date Jan. 10, 2022,
PCT Pub. No. WO2021/013544, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 10 2019 120 012.1 (DE), filed on Jul. 24, 2019.
Prior Publication US 2022/0250048 A1, Aug. 11, 2022
Int. Cl. B01J 37/18 (2006.01); B01J 23/745 (2006.01); B01J 37/08 (2006.01); C01C 1/04 (2006.01); G01N 21/75 (2006.01)
CPC B01J 37/18 (2013.01) [B01J 23/745 (2013.01); B01J 37/08 (2013.01); C01C 1/0411 (2013.01); G01N 21/75 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A process for activating catalysts and catalyst precursors for ammonia synthesis, comprising the process steps of:
(A) performing a reduction of iron oxides using at least one reducing gas and by means of heating,
(B) measuring a concentration of water formed in a gas phase during the reduction by means of non-dispersive infrared spectroscopy (NDIR), and
(C) setting a flow rate of the at least one reducing gas and/or a heating rate as a function of the concentration of water formed.