PROCESS FOR DENITRIFICATION OF EXHAUST GASES EXTRACTING NITRIC ACID BY THE SAME PROCESS

摘要

A method for the removal of nitrogen oxides from waste gases and for obtaining nitric acid is described. The waste gas is charged with the required amount of hydrogen peroxide, converted into the gas phase, and the gas mixture is reacted on a solid catalyst to hydrogen nitrate, which is either withdrawn for further use or is converted into nitric acid either by condensation or by scrubbing with water. The method permits the removal of NOx at low concentrations below 2000 ppm with efficiencies above 90%.