CATALYTIC SYSTEM, AND ALSO METHOD FOR CATALYTIC COMBUSTION OF AMMONIA TO NITROGEN OXIDES IN MEDIUM PRESSURE INSTALLATION Russian patent published in 2023 - IPC B01J23/42 B01J35/04 B01J35/10 C01B21/26 

FIELD: catalytic systems.

SUBSTANCE: present invention relates to a catalytic system for the catalytic combustion of ammonia to form nitrogen oxides and a method for the catalytic combustion of ammonia to nitrogen oxides in a medium pressure unit. A catalytic system is described for the catalytic combustion of ammonia to nitrogen oxides in a medium-pressure unit with mesh layers of catalyst woven or knitted or crocheted from wire based on the precious metal platinum, which, located one after another in the direction of fresh gas flow, form a catalyst packing, wherein the catalyst packing consists of a front ensemble with three catalyst meshes having the first average surface density, and a downstream ensemble of catalyst mesh layers located behind the front ensemble, having a second average surface density, and the decrease in the average surface density of the front ensemble relative to the second average surface density is from 1.5% to 29%, and the fact that the first average surface density lies in the range from 410 to 530 g/m2, and the second average surface density in the range from 540 to 790 g/m2. Also described is a method for the catalytic combustion of ammonia to nitrogen oxides in a medium pressure unit by passing fresh gas containing ammonia and oxygen through the catalytic system, wherein the ammonia is burned, the fresh gas having an ammonia content of 9.5 to 12 vol.% under pressure in in the range from 3.5 to 7 bar and catalyst grid temperature in the range from 870°C to 920°C is carried out with a flow rate through the above-described catalytic system in the range from 6 to 16 tN/m²⋅days.

EFFECT: achievement of a yield of the main product NO comparable to the industry standard, with a reduced use of precious metals.

14 cl, 3 dwg, 6 tbl