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1. (WO2017034466) EXHAUST TREATMENT SYSTEM AND METHOD FOR TREATMENT OF AN EXHAUST GAS STREAM

Pub. No.:    WO/2017/034466    International Application No.:    PCT/SE2016/050798
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Fri Aug 26 01:59:59 CEST 2016
IPC: F01N 3/20
B01D 53/94
F01N 3/035
Applicants: SCANIA CV AB
Inventors: NILSSON, Magnus
BIRGERSSON, Henrik
Title: EXHAUST TREATMENT SYSTEM AND METHOD FOR TREATMENT OF AN EXHAUST GAS STREAM
Abstract:
An exhaust treatment system arranged for treatment of an exhaust stream, is presented. According to the present invention the exhaust treatment system comprises: - a first oxidation catalyst, arranged to oxidise compounds comprising one or more of nitrogen, carbon, and hydrogen in the exhaust stream; - a first dosage device arranged to supply a first additive into the exhaust stream; - a catalytic filter, consisting of a particulate filter with an at least partly catalytic coating with reduction characteristics, and which is arranged for catching and oxidising soot particles and for a first reduction of an amount of nitrogen oxides NOx in the exhaust stream with the use of the first additive; - a second oxidation catalyst, arranged to oxidise one or more of nitrogen oxide NO and incompletely oxidised carbon compounds in the exhaust stream; - a second dosage device arranged to supply a second additive into the exhaust stream; and - a reduction catalyst device, arranged for a second reduction of nitrogen oxides N0X in the exhaust stream, with the use of at least one of the first and second additives.