Patent ID: 6475453
Filing Date: 2002-11-05
Classification: B01D,B01J,F01N,Y02T

Abstract:
A configuration for decomposing nitrogen oxides in a gas stream flow, comprising:a plurality of catalytic converters including a first catalytic converter and a second catalytic converter disposed one behind the other in a flow direction of a gas stream for receiving and conducting said gas stream flow, each of said plurality of catalytic converters having a honeycomb structure with a multiplicity of parallel cells through which the gas stream flows, each of said plurality of catalytic converters also having a predetermined cell density of said parallel cells and a predetermined average level of catalytic activity for decomposing nitrogen oxides defined by a percentage of weight of a catalytically active agent in a respective catalytic converter, said predetermined cell density of said second catalytic converter being lower than said predetermined cell density of said first catalytic converter, and said predetermined average level of catalytic activity of said second catalytic converter being higher than said predetermined average level of catalytic activity of said first catalytic converter.