Patent ID: 7259121

Claim:
A method of reducing the content of N 2 O in gases which comprises passing the N 2 O-containing gas over a zeolite catalyst which comprises lattice aluminum which is optionally partly replaced by one or more elements selected from the group consisting of B, Be, Ga, Fe, Cr, V, As, Sb and Bi, together with nonlattice aluminum and optionally further nonlattice atoms selected from the group consisting of B, Be, Ga, Fe, Cr, V, As, Sb and Bi, has a molar ratio of nonlattice aluminum to lattice aluminum in the range from 1:2 to 20:1 and is present in the H form and/or contains exchanged iron, and the reducing the N 2 O content by catalytically decomposing N 2 O into nitrogen and oxygen in the absence of reducing agents for N 2 O.