Patent ID: 8201399

Claim:
Apparatus for reducing emissions of polychlorinated dibenzodioxins (PCDD) and polychlorinated dibenzofurans (PCDF) in exhaust gas of an internal combustion engine, the apparatus comprising: a transition metal-containing catalyzer for the selective catalytic reduction of nitric oxides in the exhaust gas; and a molecular sieve arranged upstream of the transition metal-containing catalyzer, the molecular sieve blocking hydrocarbons from reaching the transition metal-containing catalyzer, the molecular sieve being arranged one of: on the transition metal-containing layer; and as a layer on a carrier upstream of the transition metal-containing layer, the molecular sieve having pore diameters in a range between 3 Å and 12 Å, and the molecular sieve being devoid of transition metals or having a concentration of at least one transition metal lower than the concentration of said at least one transition metal in the transition metal-containing catalyzer.