Patent ID: 8173074
Filing Date: 2012-05-08
Classification: B01D,B01J,F01N,Y02T

Abstract:
1. Apparatus for reducing emissions of polychlorinated dibenzodioxins (PCDD) and polychlorinated dibenzofurans (PCDF) in exhaust gas of an internal combustion engine, the apparatus comprising: a particle filter having an inlet side and an outlet side; a transition metal-containing catalyzer for the selective catalytic reduction of nitric oxides in the exhaust gas by at least one of: ammonia and reducing agents that split off ammonia; and at least one of a catalyzer for oxidizing hydrocarbon-containing PCDD and PCDF precursor substances arranged upstream of the transition metal-containing catalyzer; and a catalyzer for degrading at least one of PCDD and PCDF arranged downstream of the transition metal-containing catalyzer; wherein at least one of said catalyzer for oxidizing hydrocarbon-containing PCDD and PCDF precursor substances and said catalyzer for degrading at least one of PCDD and PCDF is active for reducing nitric oxide in the presence of ammonia; and wherein the transition metal-containing catalyzer is formed on the particle filter and the catalyzer for oxidizing hydrocarbon-containing PCDD and PCDF precursor substances is formed on the inlet side of the particle filter.