| abstract |
The present invention relates to a catalytic device for purifying exhaust gases containing nitrogen oxides using selective catalytic reduction (SCR), the catalyst device comprising at least two catalyst layers, the first layer being vanadium oxide, and A catalytic device containing a mixed oxide of titanium oxide and silicon oxide, the second layer containing a molecular sieve containing iron, and wherein the first layer is applied over the second layer. The invention also relates to the use of said catalyst device and to a method for purifying exhaust gases. |