Patent ID: 8318103
Filing Date: 2012-11-27
Classification: B01D,C01C,F01N,Y02A,Y02P,Y02T

Abstract:
1. A catalytic converter assembly for use in an exhaust gas post treatment system of an internal combustion engine, having an exhaust gas duct in which an SCR catalytic converter is fluidically disposed in the flow direction of the exhaust gas, a reductant generating system (RGS) including an NO x and CO/H 2 generating unit having an air supply inlet and a fuel supply inlet and an outlet connected to an inlet of an NO x reservoir/ammonia generating unit having an outlet connected to said exhaust gas duct upstream of said SCR catalytic converter for supplying ammonia as reductant to the SCR catalytic converter, and wherein said NO x and CO/H 2 generating unit is adapted to be at least intermittently supplied via a fuel supply to said fuel supply inlet and an air supply to said air supply inlet with starting materials for generating the ammonia, the improvement comprising said combined NO x reservoir/ammonia generating unit comprises a catalytic converter assembly with at least one type A and one type B catalytic converter section having different characteristic properties and functionalities in the flowthrough direction, the at least one type A catalytic converter having high activity with respect to its reduction and/or oxidation properties, compared to the at least one type B catalytic converter, the catalytic converter assembly, in the flowthrough direction, first having a type A catalytic converter, then a type B catalytic converter, and at the end another type A catalytic converter; and said catalytic converter assembly having a catalytic converter formulation comprising at least one oxygen-storing and/or CO-adsorbing compound disposed in a downstream section thereof.