Technologies For Simultaneous Low-Temperature Catalytic Removal Of Nox And N2o From The Tail Gases Of Nitric Acid Plants

The reasons for the formation of nitrous oxide (a greenhouse gas with CO2-equivalent equal to 310) at modern plants manufacturing weak nitric acid are analyzed. The amount of annual N2O emission depending on the operating conditions of the ammonia converter and on the method of the removal of nitrogen oxides NOx is estimated. A technological scheme of simultaneous low-temperature removal of NOx and N2O from exhaust tail gases is proposed, in which V/Al catalyst for the selective catalytic reduction (SCR) of NOx with ammonia and Cs/Co3O4 catalyst for N2O decomposition are used. Mathematical modeling of a 2-layer catalytic reactor is carried out; the charges of both SCR catalyst and N2O decomposition catalyst are determined, which ensures compliance with environmental emission standards for all nitrogen oxides.