Patent ID: 6516611
Filing Date: 2003-02-11
Classification: B01D,B01J,F01N,Y02C

Abstract:
A process for removing soot from exhaust gas of a diesel engine comprising oxidizing nitrogen monoxide present in the exhaust gas to nitrogen dioxide, in at least two consecutive process stages, separating the soot from an exhaust gas stream with an efficiency W between 0.05 and 0.95 in each process stage, wherein each process stage is assigned a transmission for soot in accordance with T=1âˆ’W and the total transmission of the process for soot is given as the product of the transmissions of all the process stages and oxidizing the soot using the nitrogen dioxide produced; wherein the transmission for soot in each following process stage is reduced in such a way that the amount of soot separated is approximately the same in each of the process stages, and wherein oxidation of nitrogen monoxide to nitrogen dioxide and separation and oxidation of the soot particles is performed on filter elements for soot which are provided with a catalyst coating for the oxidation of nitrogen monoxide to nitrogen dioxide.