Patent ID: 7906091

Claim:
An apparatus for removing N 2 O from a reaction gas generated by the combustion of ammonia during nitric acid production, said apparatus being located upstream of an absorption column and downstream of at least one heat exchanger, wherein said at least one heat exchanger is positioned, in the direction of gas flow, after the combustion of ammonia, the at least one heat exchanger cools the gas originating from the combustion of ammonia resulting in a feed gas for N 2 O decomposition having a temperature in the range of 350 to 600° C., an NO x content in the range of 3 to 17% by volume, and an H 2 O content in the range of 5 to 25% by volume, and the apparatus for removing N 2 O includes a catalyst which is substantially composed of one or more iron-loaded zeolites wherein x=from 1 to 2.