Method and device for reducing the nox and n2o of gases

Abstract

The method comprises the following steps: conduction of the gas containing N2O and NOx over a series of two catalyst beds consisting of one or more zeolites° charged with iron: addition of a reduction agent for NOx between the catalyst beds; setting of a temperature of less than 500° C. in the first and second catalyst bed; setting of a gas pressure of at least 2 bar in the two catalyst beds; and the selection of a space velocity in the first and second catalyst bed that achieves a degradation of the N2O content of the gas in the first catalyst bed by a maximum of up to 90%, in relation to the N2O content at the entrance to the catalyst bed and an additional degradation of the N2O content of the gas in the second catalyst bed by at least 30% in relation to the N2O content at the entrance to the second catalyst bed. The first reaction zone is used to degrade the N2O and the second reaction zone reduces the NOx and breaks down at least part of the remaining N2O. The inventive device comprises at least one radially traversed catalyst bed.

Dependencies are inferred from the claim text.