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    Exhaust gas treatment units for internal combustion engines and processes for operating them
    3.
    发明授权
    Exhaust gas treatment units for internal combustion engines and processes for operating them 有权
    用于内燃机的废气处理装置及其操作过程

    公开(公告)号：US06725647B2

    公开(公告)日：2004-04-27

    申请号：US10058685

    申请日：2002-01-28

    申请人： Marcus Pfeifer ,  Barry Van Setten ,  Jurgen Gieshoff ,  Paul Spurk ,  Egbert Lox ,  Thomas Kreuzer

    发明人： Marcus Pfeifer ,  Barry Van Setten ,  Jurgen Gieshoff ,  Paul Spurk ,  Egbert Lox ,  Thomas Kreuzer

    IPC分类号： F01N300

    CPC分类号： F01N3/0842 ,  B01D53/9418 ,  B01D53/944 ,  B01D53/945 ,  B01D53/9477 ,  B01D2255/1021 ,  B01D2255/911 ,  F01N3/0814 ,  F01N3/20 ,  F01N13/009 ,  F01N13/0097 ,  Y02T10/22 ,  Y02T10/24

    摘要： The present invention provides an exhaust gas treatment unit for an internal combustion engine. A first catalyst unit produces ammonia from corresponding constituents in a rich exhaust gas composition. A second catalyst unit that is located downstream of the first catalyst unit temporarily stores the ammonia produced by the first catalyst unit in the presence of a rich exhaust gas composition. In the presence of a lean exhaust gas composition, the nitrogen oxides present in the exhaust gas are subjected to a reduction reaction using the temporarily stored ammonia as reducing agent. The exhaust gas treatment unit also contains a third catalyst unit that is located between the other two catalyst units, and oxidizes the nitrogen oxides present in the exhaust gas at lean exhaust gas conditions to a such an extent that 25 to 75 vol. % of the nitrogen oxides entering the second catalyst unit consist of nitrogen dioxide.

    摘要翻译： 本发明提供一种用于内燃机的废气处理单元。 第一催化剂单元从富排气组合物中的相应组分产生氨。 位于第一催化剂单元下游的第二催化剂单元在富排气组合物的存在下临时存储由第一催化剂单元产生的氨。 在贫废气组合物的存在下，使用临时储存的氨作为还原剂对废气中存在的氮氧化物进行还原反应。 排气处理单元还含有位于其他两个催化剂单元之间的第三催化剂单元，并且将贫排气条件下的排气中存在的氮氧化物氧化至25〜75体积％ 进入第二催化剂单元的氮氧化物的％由二氧化氮组成。

    Method and apparatus for determining the activity and aging behavior of a catalyst
    9.
    发明申请
    Method and apparatus for determining the activity and aging behavior of a catalyst 审中-公开
    用于确定催化剂的活性和老化行为的方法和装置

    公开(公告)号：US20060216202A1

    公开(公告)日：2006-09-28

    申请号：US10559555

    申请日：2004-06-03

    申请人： Jurgen Gieshoff ,  Hartmut Finkbeiner ,  Egbert Lox ,  Thomas Kreuzer

    发明人： Jurgen Gieshoff ,  Hartmut Finkbeiner ,  Egbert Lox ,  Thomas Kreuzer

    IPC分类号： G01N31/10

    CPC分类号： F01N11/00 ,  F01N2550/02 ,  F01N2550/20 ,  Y02T10/47

    摘要： The invention relates to a method of determining activity and aging behavior of a catalyst. For this purpose, two independent substreams of combustion offgases are produced and mixed before coming into contact with the catalyst. The first substream of combustion offgases is preferably produced by burning a motor fuel and forms the major part of the combustion offgases. The second substream of combustion offgases is produced by means of a gas burner whose air ratio can be adjusted within a wide range. Mixing of this second substream of combustion offgases into the first substream enables the composition of the total stream to be set in a defined manner.

    摘要翻译： 本发明涉及一种确定催化剂的活性和老化行为的方法。 为此，在与催化剂接触之前，产生和混合两个独立的燃烧废气子流。 燃烧废气的第一个子流优选通过燃烧电动机燃料并形成燃烧废气的主要部分而产生。 燃烧废气的第二子流通过气体燃烧器产生，其空气比可以在宽范围内调节。 将第二子燃烧废气混合到第一子流中使得能够以限定的方式设定总流的组成。