DEVELOPMENT OF IMPROVED CATALYST DOWNLOAD Russian patent published in 2009 - IPC C01B21/26 

FIELD: chemistry.

SUBSTANCE: initial gas-flow passes the first ammonia oxidation stage containing the catalyst (the metal of platinum group with large surface area) whereat it is converted with the yield 20 - 99% to the nitrogen oxides. Then the gas mix containing the nitrogen oxides, oxygen and unreacted ammonia pass the second ammonia oxidation stage containing the catalyst promoting as well the destruction of N₂O. The second stage products contain the traces of unreacted ammonia and less than 500 ppm of N₂O. The process is carried out at temperature range 700 - 1000°C. The method of catalyst download for the implementation of aforementioned process is claimed. The preferable implementation versions allow obtaining of the low N₂O yields and increasing of the catalyst operating life.

EFFECT: high ammonia conversion, low yield of N₂O, performance improving at startup and shutdown of the process, lower consumption of the platinum group metals and increasing of the catalyst operating life.

11 cl, 1 tbl, 1 dwg, 11 ex