PROCESS AND APPARATUS FOR REDUCING THE CONTENT OF NOX AND N2O IN GASES

摘要

The method comprises the following steps: conduction of the gas containing N 2O and NOx over a series of two catalyst beds consisting of one or more zeolite s charged with iron; addition of a reduction agent for NOx between the catalys t 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 catalys t 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 t he entrance to the catalyst bed and an additional degradation of the N2O conten t of the gas in the second catalyst bed by at least 30 % in relation to the N2 O 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 compris es at least one radially traversed catalyst bed.