Patent ID: 7462340

Claim:
A process for reducing the content of NO x and N 2 O in gases comprising a) passing the N 2 O- and NO x -containing gas over a sequence of two catalyst beds comprising one or more iron-laden zeolites, b) adding a reducing agent for NO x between the catalyst beds, c) setting a temperature of less than 500° C. in the first catalyst bed and second catalyst bed, d) setting a gas pressure of at least 2 bar in the two catalyst beds, e) selecting a space velocity in the first and second catalyst beds such that a reduction in the N 2 O content of the gas by not more than 90%, based on the N 2 O content at the entrance to the first catalyst bed, occurs in the first catalyst bed and an N 2 O content of greater than 200 ppm is established and that a further reduction in the N 2 O content of the gas by at least 30%, based on the N 2 O content at the entrance to the second catalyst bed, occurs in the second catalyst bed.