METHOD OF AMMONIA CONVERSION Russian patent published in 2002 - IPC

FIELD: production of nitric acid, particularly, methods of ammonia conversion with use of two-stage catalytic system in units. SUBSTANCE: method consists in passing of reaction gas mixture containing ammonia and oxygen-containing gas through two-stage catalytic system in which the first stage in flow path of gas mixture is used in the form of layer of platinoid nets, and the second stage is in the form of catalyst layer of regular cellular structure. Additionally located above the first stage is layer of inert packing of cellular structure 15-30 mm high at distance from layer of platinoid nets equaling 0.4 of its height. Used at the second stage of catalyst system is layer of catalyst of regular cellular structure 25-40 mm. EFFECT: increased yield of nitric oxide by 0.1-0.3% and reduced losses of platinoids by 0.005-0.01 g/t of nitric acid. 1 tbl, 4 ex