| 摘要 |
The method comprises passing an N<SUB>2</SUB>O- and NO<SUB>x</SUB>-containing gas over a sequence of two catalyst beds, adding reducing agents for NO<SUB>x </SUB>and for N<SUB>2</SUB>O between the catalyst beds in such an amount that not only NO<SUB>x </SUB>but also a predetermined proportion of N<SUB>2</SUB>O is reduced. The reaction conditions are set so that the N<SUB>2</SUB>O content of the gas is reduced by not more than 95%, based on the N<SUB>2</SUB>O content at the entrance of the first catalyst bed, by decomposition to nitrogen and oxygen in the first catalyst bed and that not only chemical reduction of NO<SUB>x </SUB>but also chemical reduction of N<SUB>2</SUB>O occurs in the second catalyst bed so that the N<SUB>2</SUB>O content of the gas is reduced by at least 50%, based on the N<SUB>2</SUB>O content at the entrance of the second catalyst bed.
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