公开(公告)号：US08398943B2

公开(公告)日：2013-03-19

申请号：US12969434

申请日：2010-12-15

申请人： Andreas Döring ,  Florian Wälde

发明人： Andreas Döring ,  Florian Wälde

IPC分类号： B01D47/00

CPC分类号： F01N3/2066 ,  F01N3/106 ,  F01N3/2882 ,  F01N13/009 ,  F01N13/0093 ,  F01N13/0097 ,  F01N2240/40 ,  F01N2370/02 ,  F01N2610/02 ,  Y02T10/24

摘要： An arrangement and method for reducing the nitrogen oxide content in the exhaust gas of an internal combustion engine with the aid of ammonia and/or ammonia-releasing reduction agents, whereby ammonia and/or ammonia-containing reduction agent is added to the exhaust gas stream upstream of a catalyst combination composed of an SCR catalyst and a subsequent NH3-oxidation catalyst in such a way that a homogeneous mixture of exhaust gas and ammonia is present upstream of the SCR catalyst. To optimize the reaction or conversion of nitrogen oxides, disposed downstream of the combination of a first SCR catalyst and a first NH3-oxidation catalyst is at least one second catalyst having SCR activity in order in this way to reduce the nitrogen oxides formed at the first NH3-oxidation catalyst due to insufficient selectivity of the catalyst to nitrogen with not yet oxidized NH3.

摘要翻译： 借助于氨和/或氨释放还原剂来减少内燃机的废气中的氮氧化物含量的装置和方法，其中将氨和/或含氨还原剂加入废气流中 在由SCR催化剂和随后的NH 3 - 氧化催化剂组成的催化剂组合的上游，以使排气和氨的均匀混合物存在于SCR催化剂的上游。 为了优化氮氧化物的反应或转化，设置在第一SCR催化剂和第一NH 3 - 氧化催化剂的组合下游的是具有SCR活性的至少一种第二催化剂，以这种方式降低在第一SCR催化剂和第一NH 3 - 氧化催化剂形成的氮氧化物 NH3氧化催化剂由于催化剂对尚未被氧化的NH 3的氮的选择性不足。